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Your search keyword '"Chemerisov, S."' showing total 92 results
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92 results on '"Chemerisov, S."'

1. Temperature and magnetic field dependent longitudinal spin relaxation in nitrogen-vacancy ensembles in diamond

Author

Jarmola, A., Acosta, V. M., Jensen, K., Chemerisov, S., and Budker, D.

Subjects
Condensed Matter - Materials Science
Abstract

We present an experimental study of the longitudinal electron-spin relaxation time (T1) of negatively charged nitrogen-vacancy (NV) ensembles in diamond. T1 was studied as a function of temperature from 5 to 475 K and magnetic field from 0 to 630 G for several samples with various NV and nitrogen concentrations. Our studies reveal three processes responsible for T1 relaxation. Above room temperature, a two-phonon Raman process dominates, and below, we observe an Orbach-type process with an activation energy, 73(4) meV, which closely matches the local vibrational modes of the NV center. At yet lower temperatures, sample dependent cross relaxation processes dominate, resulting in temperature independent values of T1, from ms to minutes. The value of T1 in this limit depends sensitively on magnetic field and can be tuned by more than an order of magnitude., Comment: 5 pages, 3 figures, and 3 pages of supplemental material with additional figures

Published
2011
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2. The Microwave Air Yield Beam Experiment (MAYBE): measurement of GHz radiation for Ultra-High Energy Cosmic Rays detection

Author

Monasor, M., Bohacova, M., Bonifazi, C., Cataldi, G., Chemerisov, S., Neto, J. R. T. De Mello, Luis, P. Facal San, Fox, B., Gorham, P. W., Hojvat, C., Hollon, N., Meyhandan, R., Reyes, L. C., D'Orfeuil, B. Rouille, Santos, E. M., Pochez, J., Privitera, P., Spinka, H., Verzi, V., Williams, C., and Zhou, J.

Subjects
Physics - Instrumentation and Detectors, Astrophysics - High Energy Astrophysical Phenomena, High Energy Physics - Experiment
Abstract

We present first measurements by MAYBE of microwave emission from an electron beam induced air plasma, performed at the electron Van de Graaff facility of the Argonne National Laboratory. Coherent radio Cherenkov, a major background in a previous beam experiment, is not produced by the 3 MeV beam, which simplifies the interpretation of the data. Radio emission is studied over a wide range of frequencies between 3 and 12 GHz. This measurement provides further insight on microwave emission from extensive air showers as a novel detection technique for Ultra-High Energy Cosmic Rays., Comment: 4 pages, 4 figures, published in the proceedings of 32nd International Cosmic Ray Conference (ICRC)

Published
2011
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3. High nitrogen-vacancy density diamonds for magnetometry applications

Author

Acosta, V. M., Bauch, E., Ledbetter, M. P., Santori, C., Fu, K. -M. C., Barclay, P. E., Beausoleil, R. G., Linget, H., Roch, J. F., Treussart, F., Chemerisov, S., Gawlik, W., and Budker, D.

Subjects
Condensed Matter - Materials Science, Condensed Matter - Mesoscale and Nanoscale Physics, Physics - Instrumentation and Detectors, Quantum Physics
Abstract

Nitrogen-vacancy (NV) centers in millimeter-scale diamond samples were produced by irradiation and subsequent annealing under varied conditions. The optical and spin relaxation properties of these samples were characterized using confocal microscopy, visible and infrared absorption, and optically detected magnetic resonance. The sample with the highest NV- concentration, approximately 16 ppm = 2.8 x 10^{18} cm^{-3}, was prepared with no observable traces of neutrally-charged vacancy defects. The effective transverse spin relaxation time for this sample was T2* = 118(48) ns, predominately limited by residual paramagnetic nitrogen which was determined to have a concentration of 52(7) ppm. Under ideal conditions, the shot-noise limited sensitivity is projected to be ~150 fT/\sqrt{Hz} for a 100 micron-scale magnetometer based on this sample. Other samples with NV- concentrations from .007 to 12 ppm and effective relaxation times ranging from 27 to 291 ns were prepared and characterized., Comment: Accepted by PRB (July 29, 2009), 24 pages, 10 figures, 3 tables

Published
2009
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6. Irradiation of 20L LEU Uranyl Sulfate Solution for Production of Mo-99

Author

Chemerisov, S., primary, Kalensky, M., additional, McLain, D., additional, Tkac, P., additional, Brossard, T., additional, Quigley, K., additional, Byrnes, J., additional, Rotsch, D., additional, Krebs, J., additional, Gromov, R., additional, Bailey, J., additional, Micklich, B., additional, Jerden, J., additional, Vandegrift, G., additional, Youker, A., additional, Alford, K., additional, Wesolowski, K., additional, Jonah, C., additional, Patapenka, A., additional, and Reavis, A., additional

Published
2021
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19. Micro-Bubble Experiments at the Van de Graaff Accelerator

Author

Sun, Z. J., primary, Wardle, Kent E., additional, Quigley, K. J., additional, Gromov, Roman, additional, Youker, A. J., additional, Makarashvili, Vakhtang, additional, Bailey, James, additional, Stepinski, D. C., additional, Chemerisov, S. D., additional, and Vandegrift, G. F., additional

Published
2015
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26. First results from the microwave air yield beam experiment (MAYBE): Measurement of GHz radiation for ultra-high energy cosmic ray detection

Author

Verzi V., Spinka H., Privitera P., Pochez J., Santos E.M., Monasor M., d'Orfeuil B. Rouillé, Meyhandan R., Hojvat C., Hollon N., Gorham P.W., Luis P. Facal San, Fox B., de Mello Neto J.R.T., Cataldi G., Chemerisov S., Bonifazi C., Boháčová M., Williams C., and Zhou J.

Subjects
Physics, QC1-999
Abstract

We present measurements of microwave emission from an electron-beam induced air plasma performed at the 3 MeV electron Van de Graaff facility of the Argonne National Laboratory. Results include the emission spectrum between 1 and 15 GHz, the polarization of the microwave radiation and the scaling of the emitted power with respect to beam intensity. MAYBE measurements provide further insight on microwave emission from extensive air showers as a novel detection technique for Ultra-High Energy Cosmic Rays.

Published
2013
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29. Radio of Nitrate and Sulfate Solutions

Author

Kalensky, M., primary, Chemerisov, S., additional, Youker, A.J., additional, Hebden, A., additional, Tkac, P., additional, Makarashvili, V., additional, Krahn, E., additional, Krebs, J., additional, Quigley, K., additional, Lowe, R., additional, Bowers, D., additional, Niak, S., additional, Graczyk, D., additional, Sullivan, V., additional, Bakel, A., additional, and Vandegrift, G.F., additional

Published
2013
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33. Sorbent Selection Progress Report

Author

Stepinski, D., primary, Ziegler, A. J., additional, Jerden, J., additional, Fortner, J., additional, Quigley, K., additional, Mertz, C., additional, Gelis, A., additional, Chemerisov, S., additional, Tsai, Y., additional, Bakel, A., additional, Vandegrift, G. F., additional, Chun, P., additional, and Wang, L., additional

Published
2009
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36. First results from the microwave air yield beam experiment (MAYBE): Measurement of GHz radiation for ultra-high energy cosmic ray detection

Author

Williams, C., primary, Boháčová, M., additional, Bonifazi, C., additional, Cataldi, G., additional, Chemerisov, S., additional, de Mello Neto, J.R.T., additional, Luis, P. Facal San, additional, Fox, B., additional, Gorham, P.W., additional, Hojvat, C., additional, Hollon, N., additional, Meyhandan, R., additional, Monasor, M., additional, d'Orfeuil, B. Rouillé, additional, Santos, E.M., additional, Pochez, J., additional, Privitera, P., additional, Spinka, H., additional, Verzi, V., additional, and Zhou, J., additional

Published
2013
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37. Measurements of the GHz emission by a 3 MeV electron beam

Author

San Luis, P. Facal, primary, Boháčová, M., additional, Bonifazi, C., additional, Cataldi, G., additional, Chemerisov, S., additional, de Mello Neto, J. R. T., additional, Fox, B., additional, Gorham, P. W., additional, Hojvat, C., additional, Hollon, N., additional, Meyhandan, R., additional, Monasor, M., additional, d'Orfeuil, B. Rouillé, additional, Santos, E. M., additional, Pochez, J., additional, Privitera, P., additional, Spinka, H., additional, Verzi, V., additional, and Zhou, J., additional

Published
2013
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47. Magnetic properties of metal–quinone high-spin complexes prepared by solid-state mechano-activation and by chemical synthesis in solution. Comparative study with very high-field and low-temperature EPR and ENDOR

Author

Chemerisov, S. D., primary, Perekhodtsev, G. D., additional, Tipikin, D. S., additional, Lebedev, Ya. S., additional, Prokof'ev, A. I., additional, Aleksandrov, A. I., additional, Dubinskii, A. A., additional, Möbius, K., additional, Poluektov, O. G., additional, and Schmidt, J., additional

Published
1996
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49. PHOTOIONIZATION AND ENERGY-DEPENDENT PHOTOCHEMISTRY OF HYDROCARBONS IN ZSM5.

Author

Chemerisov, S. D., Werst, D. W., and Trifunac, A. D.

Subjects
*PHOTOIONIZATION, *MOLECULES, *ZEOLITES
Abstract

Presents a study on the processes of photoionization involving unsaturated hydrocarbon molecules absorbed in ZSM5 zeolites under oxygen-free conditions. Properties and functions of zeolites; Details on the experiment; Results and discussion.

Published
1999
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50. Formation of high-spin complexes in reactions of oxides of the γ-Al2O3 type with radical pairs of sterically shielded semiquinones: A new procedure for the preparation of organometallic polyradicals and their ESR spectra.

Author

Vorob'eva, G., Chemerisov, S., Kozintsev, A., and Lebedev, Ya.

Abstract

A new simple method was developed for the preparation of organometallic bi- and triradicals by the heterogeneous reaction of γ-Al2O3 or analogous oxides with free radicals generated in solution through the interaction of 3,6-di- tert-butyl- o-benzoquinone with 3,6-di- tert-butylpyrocatechol. An explanation was offered for the plus sign of the dipoledipole coupling constant observed previously in the ESR spectra recorded in a superstrong field at low temperatures. [ABSTRACT FROM AUTHOR]

Published
1997
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