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205 results on '"Elisei F"'

9. The liquid handling systems for the Borexino solar neutrino detector

Author

Alimonti, G., Arpesella, C., Avanzini, M.B., Back, H., Balata, M., Bartolomei, D., de Bellefon, A., Bellini, G., Benziger, J., Bevilacqua, A., Bondi, D., Bonetti, S., Brigatti, A., Caccianiga, B., Cadonati, L., Calaprice, F., Carraro, C., Cecchet, G., Cereseto, R., Chavarria, A., Chen, M., Chepurnov, A., Cubaiu, A., Czech, W., D’Angelo, D., Dalnoki-Veress, F., Davini, S., De Bari, A., De Haas, E., Derbin, A., Deutsch, M., Di Credico, A., Di Ludovico, A., Di Pietro, G., Eisenstein, R., Elisei, F., Etenko, A., von Feilitzsch, F., Fernholz, R., Fomenko, K., Ford, R., Franco, D., Freudiger, B., Gaertner, N., Galbiati, C., Gatti, F., Gazzana, S., Gehman, V., Giammarchi, M., Giugni, D., Goeger-Neff, M., Goldbrunner, T., Golubchikov, A., Goretti, A., Grieb, C., Guardincerri, E., Hagner, C., Hagner, T., Hampel, W., Harding, E., Hardy, S., Hartmann, F.X., von Hentig, R., Hertrich, T., Heusser, G., Hult, M., Ianni, A., Ianni, An., Ioannucci, L., Jaenner, K., Joyce, M., de Kerret, H., Kidner, S., Kiko, J., Kirsten, T., Kobychev, V., Korga, G., Korschinek, G., Kozlov, Y., Kryn, D., La Marche, P., Lagomarsino, V., Laubenstein, M., Lendvai, C., Leung, M., Lewke, T., Litvinovich, E., Loer, B., Loeser, F., Lombardi, P., Ludhova, L., Machulin, I., Malvezzi, S., Manco, A., Maneira, J., Maneschg, W., Manno, I., Manuzio, D., Manuzio, G., Marchelli, M., Marternianov, A., Masetti, F., Mazzucato, U., McCarty, K., McKinsey, D., Meindl, Q., Meroni, E., Miramonti, L., Misiaszek, M., Montanari, D., Monzani, M.E., Muratova, V., Musico, P., Neder, H., Nelson, A., Niedermeier, L., Nisi, S., Oberauer, L., Obolensky, M., Orsini, M., Ortica, F., Pallavicini, M., Papp, L., Parsells, R., Parmeggiano, S., Parodi, M., Pelliccia, N., Perasso, L., Perasso, S., Pocar, A., Raghavan, R., Ranucci, G., Rau, W., Razeto, A., Resconi, E., Risso, P., Romani, A., Rountree, D., Sabelnikov, A., Saggese, P., Saldanha, R., Salvo, C., Scardaoni, R., Schimizzi, D., Schonert, S., Schubeck, K.H., Shutt, T., Siccardi, F., Simgen, H., Skorokhvatov, M., Smirnov, O., Sonnenschein, A., Soricelli, F., Sotnikov, A., Sukhotin, S., Sule, C., Suvorov, Y., Tarasenkov, V., Tartaglia, R., Testera, G., Vignaud, D., Vitale, S., Vogelaar, R.B., Vyrodov, V., Williams, B., Wojcik, M., Wordel, R., Wurm, M., Zaimidoroga, O., Zavatarelli, S., and Zuzel, G.

Published
2009
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10. The Borexino detector at the Laboratori Nazionali del Gran Sasso

Author

Alimonti, G., Arpesella, C., Back, H., Balata, M., Bartolomei, D., de Bellefon, A., Bellini, G., Benziger, J., Bevilacqua, A., Bondi, D., Bonetti, S., Brigatti, A., Caccianiga, B., Cadonati, L., Calaprice, F., Carraro, C., Cecchet, G., Cereseto, R., Chavarria, A., Chen, M., Chepurnov, A., Cubaiu, A., Czech, W., D’Angelo, D., Dalnoki-Veress, F., De Bari, A., De Haas, E., Derbin, A., Deutsch, M., Di Credico, A., Di Ludovico, A., Di Pietro, G., Eisenstein, R., Elisei, F., Etenko, A., von Feilitzsch, F., Fernholz, R., Fomenko, K., Ford, R., Franco, D., Freudiger, B., Gaertner, N., Galbiati, C., Gatti, F., Gazzana, S., Gehman, V., Giammarchi, M., Giugni, D., Goeger-Neff, M., Goldbrunner, T., Golubchikov, A., Goretti, A., Grieb, C., Hagner, C., Hagner, T., Hampel, W., Harding, E., Hardy, S., Hartmann, F.X., von Hentig, R., Hertrich, T., Heusser, G., Hult, M., Ianni, A., Ianni, An., Ioannucci, L., Jaenner, K., Joyce, M., de Kerret, H., Kidner, S., Kiko, J., Kirsten, T., Kobychev, V., Korga, G., Korschinek, G., Kozlov, Yu., Kryn, D., La Marche, P., Lagomarsino, V., Laubenstein, M., Lendvai, C., Leung, M., Lewke, T., Litvinovich, E., Loer, B., Loeser, F., Lombardi, P., Ludhova, L., Machulin, I., Malvezzi, S., Manco, A., Maneira, J., Maneschg, W., Manno, I., Manuzio, D., Manuzio, G., Marchelli, M., Martemianov, A., Masetti, F., Mazzucato, U., McCarty, K., McKinsey, D., Meindl, Q., Meroni, E., Miramonti, L., Misiaszek, M., Montanari, D., Monzani, M.E., Muratova, V., Musico, P., Neder, H., Nelson, A., Niedermeier, L., Nisi, S., Oberauer, L., Obolensky, M., Orsini, M., Ortica, F., Pallavicini, M., Papp, L., Parcells, R., Parmeggiano, S., Parodi, M., Pelliccia, N., Perasso, L., Pocar, A., Raghavan, R., Ranucci, G., Rau, W., Razeto, A., Resconi, E., Risso, P., Romani, A., Rountree, D., Sabelnikov, A., Saggese, P., Saldhana, R., Salvo, C., Scardaoni, R., Schimizzi, D., Schönert, S., Schubeck, K.H., Shutt, T., Siccardi, F., Simgen, H., Skorokhvatov, M., Smirnov, O., Sonnenschein, A., Soricelli, F., Sotnikov, A., Sukhotin, S., Sule, C., Suvorov, Y., Tarasenkov, V., Tartaglia, R., Testera, G., Vignaud, D., Vitale, S., Vogelaar, R.B., Vyrodov, V., Williams, B., Wojcik, M., Wordel, R., Wurm, M., Zaimidoroga, O., Zavatarelli, S., and Zuzel, G.

Published
2009
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11. Study of phenylxylylethane (PXE) as scintillator for low energy neutrino experiments

Author

Back, H.O., Balata, M., de Bari, A., Beau, T., de Bellefon, A., Bellini, G., Benziger, J., Bonetti, S., Brigatti, A., Buck, C., Caccianiga, B., Cadonati, L., Calaprice, F., Cecchet, G., Chen, M., Di Credico, A., Dadoun, O., D’Angelo, D., Derbin, A., Deutsch, M., Elisei, F., Etenko, A., von Feilitzsch, F., Fernholz, R., Ford, R., Franco, D., Freudiger, B., Galbiati, C., Gatti, F., Gazzana, S., Giammarchi, M.G., Giugni, D., Göger-Neff, M., Goretti, A., Grieb, C., de Haas, E., Hagner, C., Hampel, W., Harding, E., Hartmann, F.X., Hertrich, T., Hess, H., Heusser, G., Ianni, A., Ianni, A.M., de Kerret, H., Kiko, J., Kirsten, T., Korga, G., Korschinek, G., Kozlov, Y., Kryn, D., Laubenstein, M., Lendvai, C., Loeser, F., Lombardi, P., Malvezzi, S., Maneira, J., Manno, I., Manuzio, D., Manuzio, G., Masetti, F., Martemianov, A., Mazzucato, U., McCarty, K., Meroni, E., Miramonti, L., Monzani, M.E., Musico, P., Niedermeier, L., Oberauer, L., Obolensky, M., Ortica, F., Pallavicini, M., Papp, L., Parmeggiano, S., Perasso, L., Pocar, A., Raghavan, R.S., Ranucci, G., Rau, W., Razeto, A., Resconi, E., Sabelnikov, A., Salvo, C., Scardaoni, R., Schimizzi, D., Schönert, S., Schuhbeck, K.H., Seitz, E., Simgen, H., Shutt, T., Skorokhvatov, M., Smirnov, O., Sonnenschein, A., Sotnikov, A., Sukhotin, S., Tarasenkov, V., Tartaglia, R., Testera, G., Vignaud, D., Vogelaar, R.B., Vyrodov, V., Wojcik, M., Zaimidoroga, O., and Zuzel, G.

Published
2008
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14. New experimental limits on heavy neutrino mixing in 8B-decay obtained with the Borexino counting test facility

Author

Back, H. O., Belata, M., de Bari, A., Beau, T., de Bellefon, A., Bellini, G., Benziger, J., Bonetti, S., Buck, C., Caccianiga, B., Cadonati, L., Calaprice, F., Cecchet, G., Chen, M., Di Credico, A., Dadoun, O., D’Angelo, D., Derbin, A., Deutsch, M., Elisei, F., Etenko, A., von Feilitzsch, F., Fernholz, R., Ford, R., Franco, D., Freudiger, B., Galbiati, C., Gatti, F., Gazzana, S., Giammarchi, M. G., Giugni, D., Goeger-Neff, M., Goretti, A., Grieb, C., Hagner, C., Harding, E., Hartmann, F. X., Heusser, G., Ianni, A., Ianni, A. M., De Kerret, H., Kiko, J., Kirsten, T., Kobychev, V., Korga, G., Korschinek, G., Kozlov, Y., Kryn, D., Lamblin, J., Laubenstein, M., Lendvai, C., Litvinovich, E., Lombardi, P., Machulin, I., Malvezzi, S., Maneira, J., Manno, I., Manuzio, D., Manuzio, G., Masetti, F., Martemianov, A., Mazzucato, U., McCarty, K., Meroni, E., Miramonti, L., Monzani, M. E., Muratova, V., Musico, P., Niedermeier, L., Oberauer, L., Obolensky, M., Ortica, F., Pallavicini, M., Papp, L., Perasso, L., Pocar, A., Raghavan, R. S., Ranucci, G., Razeto, A., Sabelnikov, A., Salvo, C., Scardaoni, R., Schimizzi, D., Schoenert, S., Simgen, H., Shutt, T., Skorokhvatov, M., Smirnov, O., Sonnenschein, A., Sotnikov, A., Sukhotin, S., Tarasenkov, V., Tartaglia, R., Testera, G., Vignaud, D., Vogelaar, R. B., Vyrodov, V., Wojcik, M., Zaimidoroga, O., and Zuzel, G.

Published
2003
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18. Current Status of the BOREXINO experiment

Author

Galbiati, Cristiano, Back, H.O., Balata, M., de Bari, A., Beau, T., de Bellefon, A., Bellini, G., Benziger, J., Bonetti, S., Brigatti, A., Buck, C., Caccianiga, B., Cadonati, L., Calaprice, F., Cecchet, G., Chen, M., Di Credico, A., Dadoun, O., D'Angelo, D., de Haas, H., Derbin, A., Deutsch, M., Elisei, F., Etenko, A., von Feilitzsch, F., Fernholz, R., Ford, R., Franco, D., Freudiger, B., Galbiati, C., Gartner, N., Gatti, F., Gazzana, S., Giammarchi, M.G., Giugni, D., Goeger-Neff, M., Goretti, A., Grieb, C., Hagner, C., Hampel, W., Harding, E., Hartmann, F.X., Hertrich, T., Hess, H., Heusser, G., Ianni, A., Ianni, A.M., de Kerret, H., Kiko, J., Kirsten, T., Korga, G., Korschinek, G., Kozlov, Y., Kryn, D., Laubenstein, M., Lendvai, C., Leung, M., Loeser, F., Lombardi, P., Malvezzi, S., Maneira, J., Manno, I., Manuzio, D., Manuzio, G., Masetti, F., Martemianov, A., Mazzucato, U., McCarty, K., Meroni, E., Miramonti, L., Monzani, M.E., Musico, P., Niedermeier, L., Oberauer, L., Obolensky, M., Ortica, F., Pallavicini, M., Papp, L., Parmeggiano, S., Perasso, L., Pocar, A., Raghavan, R.S., Ranucci, G., Rau, W., Razeto, A., Resconi, E., Sabelnikov, A., Salvo, C., Scardaoni, R., Schimizzi, D., Schönert, S., H Schuhbeck, K., Seitz, E., Simgen, H., Shutt, T., Skorokhvatov, M., Smirnov, O., Sonnenschein, A., Sotnikov, A., Sukhotin, S., Tarasenkov, V., Tartaglia, R., Testera, G., Vignaud, D., Vogelaar, R.B., Vyrodov, V., Wojcik, M., Zaimidoroga, O., and Zuzel, G.

Published
2005
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20. Excited state behavior of diarylethenes in the subnanosecond timescale: the role of an upper singlet

Author

Aloisi, G.G., Elisei, F., Latterini, L., Mazzucato, U., and Rodgers, M.A.J.

Subjects
Isomerization -- Research, Excited state chemistry -- Research, Olefins -- Analysis, Chemistry
Abstract

Upper excited states of diarylethenes (DAEs) are involved in the relaxation processes of some styrylarenes, including 9-styrylanthracene, n-styrylnaphthalene and n-styrylphenanthrene. This was affirmed in an investigation of the effect of excitation wavelength on the fluorescence and trans->cis photoisomerization quantum yields. Depending on the nature of the polycyclic aryl group of the DAE, a fast radiative relaxation of the upper singlet to the ground state or its fast nonradiative relaxation toward the triplet manifold or toward the isomerization channel can compete with the internal conversion pathways to singlet states S(sub 1) and S(sub 0).

Published
1996

21. Measurements of extremely low radioactivity levels in BOREXINO

Author

Arpesella, C., Back, H.O., Balata, M., Beau, T., Bellini, G., Benziger, J., Bonetti, S., Brigatti, A., Buck, C., Caccianiga, B., Cadonati, L., Calaprice, F., Cecchet, G., Chen, M., Dadoun, O., D'Angelo, D., De Bari, A., de Bellefon, A., De Haas, E., de Kerret, H., Derbin, A., Deutsch, M., Di Credico, A., Elisei, F., Etenko, A., von Feilitzsch, F., Fernholz, R., Ford, R., Franco, D., Freudiger, B., Galbiati, C., Gatti, F., Gazzana, S., Giammarchi, M.G., Giugni, D., Göger-Neff, M., Goldbrunner, T., Golubchikov, A., Goretti, A., Grieb, C., Hagner, C., Hagner, T., Hampel, W., Harding, E., Hartmann, F.X., von Hentig, R., Heusser, G., Hult, M., Ianni, A., Ianni, A.M., Kiko, J., Kirsten, T., Köhler, M., Korga, G., Korschinek, G., Kozlov, Y., Kryn, D., LaMarche, P., Laubenstein, M., Lendvai, C., Loeser, F., Lombardi, P., McCarty, K., Machulin, I., Malvezzi, S., Maneira, J., Manno, I., Manuzio, G., Martemianov, A., Masetti, F., Mazzucato, U., Meroni, E., Miramonti, L., Monzani, M.E., Musico, P., Neder, H., Niedermeier, L., Nisi, S., Oberauer, L., Obolensky, M., Ortica, F., Pallavicini, M., Papp, L., Perasso, L., Pocar, A., Raghavan, R.S., Ranucci, G., Rau, W., Razeto, A., Resconi, E., Riedel, T., Sabelnikov, A., Salvo, C., Scardaoni, R., Schönert, S., Schuhbeck, K.H., Shutt, T., Simgen, H., Sonnenschein, A., Smirnov, O., Sotnikov, A., Skorokhvatov, M., Sukhotin, S., Tarasenkov, V., Tartaglia, R., Testera, G., Trincherini, P.R., Vyrodov, V., Vogelaar, R.B., Vignaud, D., Vitale, S., Wójcik, M., Zaimidoroga, O., and Zuzel, G.

Published
2002
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22. Science and technology of Borexino: a real-time detector for low energy solar neutrinos

Author

Alimonti, G, Arpesella, C, Back, H, Balata, M, Beau, T, Bellini, G, Benziger, J, Bonetti, S, Brigatti, A, Caccianiga, B, Cadonati, L, Calaprice, F, Cecchet, G, Chen, M, DeBari, A, DeHaas, E, de Kerret, H, Donghi, O, Deutsch, M, Elisei, F, Etenko, A, von Feilitzsch, F, Fernholz, R, Ford, R, Freudiger, B, Garagiola, A, Galbiati, C, Gatti, F, Gazzana, S, Giammarchi, M, Giugni, D, Golubchikov, A, Goretti, A, Grieb, C, Hagner, C, Hagner, T, Hampel, W, Harding, E, Hartmann, F, von Hentig, R, Hess, H, Heusser, G, Ianni, A, Inzani, P, Kidner, S, Kiko, J, Kirsten, T, Korga, G, Korschinek, G, Kryn, D, Lagomarsino, V, LaMarche, P, Laubenstein, M, Loeser, F, Lombardi, P, Magni, S, Malvezzi, S, Maniera, J, Manno, I, Manuzio, G, Masetti, F, Mazzucato, U, Meroni, E, Musico, P, Neder, H, Neff, M, Nisi, S, Oberauer, L, Obolensky, M, Pallavicini, M, Papp, L, Perasso, L, Pocar, A, Raghavan, R, Ranucci, G, Rau, W, Razeto, A, Resconi, E, Riedel, T, Sabelnikov, A, Saggese, P, Salvo, C, Scardaoni, R, Schoenert, S, Schuhbeck, K, Seidel, H, Shutt, T, Simgen, H, Sonnenschein, A, Smirnov, O, Sotnikov, A, Skorokhvatov, M, Sukhotin, S, Tartaglia, R, Testera, G, Vogelaar, R, Vitale, S, Wojcik, M, Zaimidoroga, O, and Zakharov, Y

Published
2002
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23. Borexino

Author

Ranucci, Gioacchino, Alimonti, G., Arpesella, C., Beck, H.O., Balata, M., Beau, T., Bellini, G., Benziger, J., Bonetti, S., Brigatti, A., Caccianiga, B., Cadonati, L., Calaprice, F.P., Cecchet, G., Chen, M., De Bari, A., De Haas, E., Donghi, O., Deutsch, M., Elisei, F., Etenko, A., Von Feilitzsch, F., Fernholz, R., Ford, R., Freudiger, B., Garagiola, A., Gatti, F., Gazzana, S., Giammarchi, M.G., Giugni, D., Golubchikov, A., Goretti, A., Grieb, C., Hagner, C., Hagner, T., Hampel, W., Harding, E., Hartmann, F.X., von Hentig, R., Hess, H., Heusser, G., Ianni, A., Inzani, P., De Kerret, H., Kidner, S., Kiko, J., Kirsten, T., Korga, G., Korschinek, G., Kryn, D., Lagomarsino, V., Laubenstein, M., Loeser, F., Lombardi, P., Magni, S., Malvezzi, S., Maneira, J., Manno, I., Manuzio, G., Masetti, F., Mazzucato, U., Meroni, E., Musico, P., Neder, H., Neff, M., Nisi, S., Oberauer, L., Obolensky, M., Pallavicini, M., Papp, L., Perasso, L., Pocar, A., Raghavan, R.S., Ranucci, G., Rau, W., Razeto, A., Resconi, E., Riedel, T., Sabelnikov, A., Saggese, P., Salvo, C., Scardaoni, R., Schnert, S., Schuubeck, K.H., Seidel, H., Shutt, T., Sonnenschein, A., Smirnov, O., Sotnikov, A., Skorokhvatov, M., Sukhotin, S., Tartaglia, R., Testera, G., Vogelaar, R.B., Vitale, S., Woijcik, M., Zaimidoroga, O., and Zakharov, Y.

Published
2001
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24. Light propagation in a large volume liquid scintillator

Author

Alimonti, G, Arpesella, C, Balata, M, Bellini, G, Benziger, J, Bonetti, S, Caccianiga, B, Cadonati, L, Calaprice, F.P, Cecchet, G, Chen, M, Darnton, N, de Bari, A, Deutsch, M, Elisei, F, von Feilitzsch, F, Galbiati, C, Gatti, F, Giammarchi, M.G, Giugni, D, Goldbrunner, T, Golubchikov, A, Goretti, A, Hagner, T, Hartmann, F.X, von Hentig, R, Heusser, G, Ianni, A, Johnson, M, Laubenstein, M, Lombardi, P, Magni, S, Malvezzi, S, Maneira, J, Manno, I, Manuzio, G, Masetti, F, Mazzucato, U, Meroni, E, Neff, M, Oberauer, L, Perotti, A, Raghavan, R.S, Ranucci, G, Resconi, E, Salvo, C, Scardaoni, R, Schönert, S, Smirnov, O, Tartaglia, R, Testera, G, Vogelaar, R.B, Vitale, S, and Zaimidoroga, O

Published
2000
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25. Performances of the CTF experiment in prospect of Borexino

Author

Ranucci, Gioacchino, Alimonti, G., Anghloher, G., Arpesella, C., Balata, M., Bellini, G., Benziger, J., Bonetti, S., Brigatti, A., Cadonati, L., Calaprice, F.P., Cecchet, G., Chen, M., Darnton, N., de Bari, A., Deutsch, M., Dossi, R., Elisei, F., von Feilitzsch, F., Galbiati, C., Garagiola, A., Gatti, F., Giammarchi, M.G., Giugni, D., Goldbrunner, T., Golubchikov, A., Goretti, A., Hagner, T., Hartmann, F., von Hentig, R., Heusser, G., Ianni, A., Jochum, J., Johnson, M., Korga, G., Laubenstein, M., Loeser, F., Lombardi, P., Magni, S., Malvezzi, S., Manno, I., Manuzio, G., Masetti, F., Mazzucato, U., Meroni, E., Neff, M., Nisi, S., Nostro, A., Oberauer, L., Perotti, A., Raghavan, P., Raghavan, R.S., Ranucci, G., Resconi, E., Ruscitti, M., Sacchetti, F., Scardaoni, R., Schönert, S., Smirnov, O., Sotnikov, A., Tartaglia, R., Testera, G., Vogelaar, B., Vitale, S., Wojcik, M., and Zaimidoroga, O.

Published
1999
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29. Photoinduced ICT vs. excited rotamer intercoversion in two quadrupolar polyaromatic N-methylpyridinium cations.

Author

Cesaretti, A., Carlotti, B., Elisei, F., Fortuna, C. G., and Spalletti, A.

Abstract

The excited state dynamics of two quadrupolar polyaromatic N-methylpyridinium cations have been fully investigated in order to acquire detailed information on their photo-induced behavior. The two molecules are symmetric push–pull compounds having a D–π–A+–π–D motif, with the same electron-acceptor central unit (A = N-methylpyridinium) and two distinctive electron-donor polyaromatic side groups (D), namely naphthyl and pyrenyl substituents. Both molecules undergo charge transfer during the absorption, as revealed by a significant solvatochromism exhibited with solvent polarity, but the fate of their excited state was found to be markedly different. The careful analysis of the data gathered from femtosecond-resolved fluorescence up-conversion and transient absorption experiments, supported by DFT quantum mechanical calculations and temperature-dependent stationary measurements, shows the leading role of intramolecular charge transfer, assisted by symmetry breaking, in the pyrenyl derivative and that of rotamer interconversion in the naphthtyl one. Both excited state processes are controlled by the viscosity rather than polarity of the solvent, and they occur during inertial solvation in low-viscous media and lengthening up to tens of picoseconds in highly viscous solvents. [ABSTRACT FROM AUTHOR]

Published
2018
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30. A cationic naphthyl derivative defies the non-equilibrated excited rotamers principle.

Author

Cesaretti, A., Carlotti, B., Elisei, F., Fortuna, C. G., Consiglio, G., and Spalletti, A.

Abstract

The ground and excited state properties of 1-methyl-2-[(E)-2-(2-naphthyl) vinyl]pyridinium iodide have been investigated in solvents of different polarities and viscosities using stationary and ultrafast time resolved spectroscopic techniques supported by density functional theory (DFT) calculations. The investigated compound shows an important negative solvatochromism, which serves as evidence of a certain push–pull character exhibited upon photoexcitation, but the most remarkable feature is an extremely large absorption spectrum, as opposed to the narrower emission band. Interestingly, both experiments and calculations have revealed a conformational disorder in the ground state between four quasi-isoenergetic rotamers which contribute to the broad absorption spectrum. These equilibria are shifted towards one prevailing species in the excited state, pointing out an unexpected and efficient rotamer interconversion during the S1 lifetime, manifestly against the non-equilibrated excited rotamers principle. The rotamer interconversion has been found to be very fast and only hindered in a rigid matrix at low temperatures. [ABSTRACT FROM AUTHOR]

Published
2017
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31. A two excited state model to explain the peculiar photobehaviour of a flexible quadrupolar D–π–D anthracene derivative.

Author

Carlotti, B., Cesaretti, A., Gentili, P. L., Marrocchi, A., Elisei, F., and Spalletti, A.

Abstract

The peculiar photobehaviour of a symmetrical arylenevinylene anthracene derivative bearing mild electron donors (alkoxy groups) at the sides of its structure has been fully comprehended through this study. An investigation into the effect of solvent polarity and temperature on the stationary fluorescence spectrum allowed a clear dual emission to be revealed. A further valuable insight was obtained, thanks to the employment of ultrafast spectroscopies. Fluorescence up-conversion measurements and the Time Resolved Area Normalised Spectra analysis provided a clear-cut proof of the presence of two distinct fluorescent states (1A* and 1B*), with 1A* being responsible for the steady-state emission in highly polar and viscous media. Femtosecond transient absorption spectra were acquired in several organic solvents of different polarity and viscosity. Interestingly, the lifetime of 1A* was found to be dependent on solvent viscosity whereas the lifetime of 1B* showed a trend which matches the change in solvent polarity. Indeed, the Density functional theory calculations predicted a structural rearrangement in the fully relaxed lowest excited singlet state. The 1A* →1B* transition is thus likely accompanied by large amplitude motions of the molecular structure, with the 1B* state also exhibiting a small intramolecular charge transfer character. The investigated flexible quadrupolar D–π–D system arouses therefore great interest as a novel material for applications in organic electronics and photonics. [ABSTRACT FROM AUTHOR]

Published
2016
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32. Unexpected multiple activated steps in the excited state decay of some bis(phenylethynyl)-fluorenes and -anthracenes.

Author

Cacioppa, G., Carlotti, B., Elisei, F., Gentili, P. L., Marrocchi, A., and Spalletti, A.

Abstract

The temperature effect on the photophysical parameters of four acetylene-derivatives [bis(phenylethynyl)-anthracenes and -fluorenes with substituents of different electron acceptor efficiencies] has been investigated by absorption and emission spectroscopy, using stationary and pulsed (ns/fs resolution) techniques. The nature of the central nucleus (anthracene or fluorene) and the peripheral electron-withdrawing group (nitro or formyl) strongly affect the deactivation of the excited states of these push–pull molecules. In some cases the study evidenced an interesting role of two activated steps in the deactivation of the excited singlet state, namely an activated inter-system crossing to an upper triplet state of n,π* nature (previously hypothesized on the basis of TD-DFT calculations) and a sort of activated internal conversion, discussed also on the basis of maximum entropy method analysis of the fluorescence decay data. Nicely, an efficient ISC was found for the fluorene-derivatives where small energy gaps between S1 (π,π*) and Tn (n,π*) states had been calculated while no activated ISC was evidenced in the case of anthryl-derivatives where higher S1–Tn energy gaps are expected. A peculiar temperature effect for a fluorene-derivative was pointed out and also explained on the basis of quantum-mechanical calculations at the DFT level taking into account the solvation effects by means of the conductor-like polarizable continuum model CPCM. The presence of dual emission, at first evidenced by a shoulder in the emission spectrum of the fluorene-derivative featuring a peripheral formyl group in dichloromethane at low temperatures, was nicely confirmed by femtosecond up-conversion measurements at room temperature. [ABSTRACT FROM AUTHOR]

Published
2016
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33. Unusual high fluorescence of two nitro-distyrylbenzene-like compounds induced by CT processes affecting the fluorescence/intersystem-crossing competition.

Author

Carlotti, B., Elisei, F., Mazzucato, U., and Spalletti, A.

Abstract

Two nitro-substituted 1,4-distyrylbenzene-like compounds have been investigated using stationary and time-resolved (ns/fs) spectrometric techniques as a function of solvent polarity. In the two compounds the central benzene ring is substituted with a p-nitrostyryl group at one side while, at the other side, compound 1 (asymmetric) bears a pyrid-4-ylethenyl group and compound 2 (symmetric) another p-nitrostyryl group. The solvent dependent intramolecular charge transfer (ICT) in the singlet manifold was found to strongly affect the competition among fluorescence, intersystem crossing and trans–cis photoisomerization. The presence of nitro-groups in the 1,4-distyrylbenzene skeleton causes the usual strong decrease of fluorescence in favour of intersystem crossing to a reactive triplet state. However, the favoured formation of the ICT state in polar solvents induces an unexpected important increase of the fluorescence quantum yield (three/two order of magnitude for the nitro and dinitro derivatives, respectively). The ultrafast spectral transients helped to understand the solvent effects measured by stationary techniques and gave information on the dynamics of the locally excited singlet state (1LE*) and the 1ICT* state, fast produced in polar solvents. Evidence of dual fluorescence in a limited range of solvent polarity, particularly for compound 1, is also reported. The role of an upper triplet state in a non-polar solvent is discussed also based on quantum-mechanical calculations (TD-DFT method) and temperature effects on the photophysical parameters. [ABSTRACT FROM AUTHOR]

Published
2015
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34. Experimental evidence of dual emission in a negatively solvatochromic push-pull pyridinium derivative.

Author

Carlotti, B., Cesaretti, A., Fortuna, C. G., Spallettia, A., and Elisei, F.

Abstract

We report here experimental evidence of dual emission in a cationic push–pull system (bearing a methyl pyridinium group as an electron acceptor and a diphenylamino group as an electron donor), which shows negative solvatochromism. An intriguing blue shift and enlargement of the fluorescence band upon increasing the solvent polarity have suggested a possible contribution of an upper excited state to the stationary emission. Ultrafast transient absorption has indeed revealed the presence of an intermediate transient species in some solvents. The investigation of the fluorescence properties at low temperatures and in the rigid matrix has given a clear indication of this additional emission at shorter wavelengths. Femtosecond up-conversion measurements have shown interesting rise-decay dynamics in the kinetics and two well distinguished emission bands characterized by different deactivations. A single isoemissive point in the time-resolved area-normalized spectra has unambiguously pointed out the presence of two consecutive emissive species: the locally excited and the intramolecular charge transfer excited states. [ABSTRACT FROM AUTHOR]

Published
2015
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35. Doxycycline and oxytetracycline loading of a zwitterionic amphoteric surfactant-gel and their controlled release.

Author

Cesaretti, A., Carlotti, B., Gentili, P. L., Clementi, C., Germani, R., and Elisei, F.

Abstract

Oxytetracycline (OX) and doxycycline (DX) are antibiotics belonging to the family of tetracyclines. We present a UV-Visible steady state and time-resolved experimental study of OX and DX and their biologically active Mg2+ complexes loaded within a hydrogel matrix. Hydrogels are a three dimensional network of worm-like micelles, mutually intertwined, forming a pattern of hydrophobic domains and water pools. We resorted to a hydrogel, made of a zwitterionic N-oxide surfactant (p-dodecyloxybenzyldimethylamine N-oxide, pDoAO), which showed promising features as a drug vehicle. The spectral and photophysical properties of the drugs are significantly altered by the inclusion in the hydrophobic domains of the gel and these variations are indicators of the permeation ratio of the drug in between the micelles forming the gel network. We thus get a clear picture of the distribution of the drug molecules and metal chelates into the two different kinds of environment, where the hydrophobic domains are also able to cause a gel-induced deprotonation of these two drugs. Furthermore, the amphoteric nature of the surfactant is responsible for its peculiar acid–base behaviour: under acidic pH conditions, the surfactant gets protonated and the stability of the gel network is damaged. This feature can be thus exploited for the pH controlled release of the tetracycline drugs. [ABSTRACT FROM AUTHOR]

Published
2014
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36. Excited-state behavior of some all-trans-alpha,omega-dithienylpolyenes

Author

Bartocci, G., Spalletti, A., Becker, R.S., Elisei, F., Floridi, S., and Mazzucato, U.

Subjects
Excited state chemistry -- Research, Polyenes -- Research, Chemistry
Abstract

A study was conducted to analyze the radiative, nonradiative and reactive relaxation pathways and photokinetic behavior of the the first oligomers of alpha,omega-diphenylpolyenes (DPhP) supporting the 2-thienyl and 3-thienyl side groups. The pathways were examined against the parent compound support n = 1 (trans,1,2-dithienylethene) and known DPhPs. Results indicated a number of analogies between the behavior of DPhPs and alpha,omega-dithienylpolyenes.

Published
1999

37. A peculiar dependence of intersystem crossing of p-nitro-2,5-distyrylfuran on the dielectric properties of the solvent.

Author

Carlotti, B., Elisei, F., and Spalletti, A.

Abstract

The excited state behaviour of EE-2-(4′-nitrostyryl),5-styryl-furan (NSF) has been studied with different stationary and pulsed spectrometric techniques in solvents of different polarity and polarizability. The interpretation of previous results on the fluorescence and intersystem crossing of NSF [Phys. Chem. Chem. Phys., 2011, 13, 4519] was found to be complicated by an uncommon effect of solvent polarity on the competitive relaxation pathways. To answer the open questions, the photobehaviour was revisited in solvents with a restricted range of the dielectric constant, also under conditions of constant polarizability, and in a large temperature range. The results thus obtained, supported by parallel quantum-mechanical calculations on the singlet/triplet properties, allowed a reasonable interpretation of the photobehaviour to be reached. This includes the role of an activated photoisomerization above room temperatures and the play of small changes of dielectric properties of the solvent in favouring ICT, thus affecting the efficiency of the ISC process, where an “inverse” energy gap trend was found to be operative. [ABSTRACT FROM AUTHOR]

Published
2011
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38. New Experimental Limits on Heavy Neutrino Mixing in [sup 8]B-Decay Obtained with the Borexino Counting Test Facility.

Author

Back, H.O., Belata, M., De Baric, A., Beau, T., De Bellefon, A., Bellini, G., Benziger, J., Bonettie, S., Buck, C., Caccianiga, B., Cadonati, L., Calaprice, F., Cecchet, G., Chen, M., Di Credico, A., Dadoun, O., D'Angelo, D., Derbin, A., Deutsch, M., and Elisei, F.

Subjects
NEUTRINOS, TESTING laboratories, NUCLEAR reactors, NUCLEAR energy
Abstract

If heavy neutrinos with mass m[sub ν[sub H]] ≥ 2m[sub e] are emitted in the decays of [sup 8]B in the Sun, then ν[sub H] → ν[sub L] + e[sup +] + e[sup –] decays should be observed. In the present work, the results of background measurements with the Borexino Counting Test Facility have been used to obtain bounds on the number of these decays. As a result, new limits on the coupling |U[sub eH]|[sup 2] of a massive neutrino in the range of 1.1 MeV to 12 MeV have been derived (|U[sub eH]|[sup 2] ≤ 10[sup –3]–10[sup –5]). The obtained limits on the mixing parameter are stronger than obtained in previous experiments using nuclear reactors and accelerators. © 2003 MAIK “Nauka / Interperiodica”. [ABSTRACT FROM AUTHOR]

Published
2003
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40. Cis-trans photoisomerization of 1,2-diarylethylenes: Effect of charge transfer interactions.

Author

Mazzucato, U., Aloisi, G., and Elisei, F.

Abstract

This paper describes the results of an extensive study of trans→ cis photoisomerization of various 1,2-diarylethylenes (DAE). The structure effect on the competitive radiative and reactive deactivations and on the isomerization mechanism (singlet/triplet, diabatic/adiabatic) is discussed. The effect of charge-transfer (CT) interactions of DAE with electron donors and acceptors are then presented. Triplet-induced isomerization is generally the common effect in non-polar solvents, and is particularly efficient when a heavy atom is involved. Typical examples of CT-induced triplet photoisomerization of DAE by electron donors and acceptors are llustrated. New results on some fluorescent cis compounds are also reported. Prevalent radical ion formation in polar solvents is shown to generally quench isomerization from trans to cis but to induce isomerization from cis to the more stable trans radical ion. [ABSTRACT FROM AUTHOR]

Published
1994
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44. Lip-Synching Using Speaker-Specific Articulation, Shape and Appearance Models

Author

Breton Gaspard, Bailly Gérard, Govokhina Oxana, and Elisei Frédéric

Subjects
Acoustics. Sound, QC221-246, Electronic computers. Computer science, QA75.5-76.95
Abstract

We describe here the control, shape and appearance models that are built using an original photogrammetric method to capture characteristics of speaker-specific facial articulation, anatomy, and texture. Two original contributions are put forward here: the trainable trajectory formation model that predicts articulatory trajectories of a talking face from phonetic input and the texture model that computes a texture for each 3D facial shape according to articulation. Using motion capture data from different speakers and module-specific evaluation procedures, we show here that this cloning system restores detailed idiosyncrasies and the global coherence of visible articulation. Results of a subjective evaluation of the global system with competing trajectory formation models are further presented and commented.

Published
2009

49. Ultra-low background measurements in a large volume underground detector

Author

Alimonti, G., Anghloher, G., Arpesella, C., Balata, M., Bellini, G., Benziger, J., Bonetti, S., Cadonati, L., Calaprice, F.P., Cecchet, G., Chen, M., Darnton, N., de Bari, A., Deutsch, M., Elisei, F., von Feilitzsch, F., Galbiati, C., Gatti, F., Giammarchi, M.G., Giugni, D., Goldbrunner, T., Golubchikov, A., Goretti, A., Hagner, T., Hartmann, F.X., von Hentig, R., Heusser, G., Ianni, A., Jochum, J., Johnson, M., Laubenstein, M., Lombardi, P., Magni, S., Malvezzi, S., Manno, I., Manuzio, G., Masetti, F., Mazzucato, U., Meroni, E., Neff, M., Nostro, A., Oberauer, L., Perotti, A., Preda, A., Raghavan, R.S., Ranucci, G., Resconi, E., Ruscitti, M., Scardaoni, R., Schönert, S., Smirnov, O., Tartaglia, R., Testera, G., Ullucci, P., Vogelaar, R.B., Vitale, S., Wojcik, M., and Zaimidoroga, O.

Published
1998
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