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1. Buffer gas cooled ice chemistry. II. Ice generation and mm-wave detection of molecules desorbed from an ice.

Author

Hager, T. J., Moore, B. M., Borengasser, Q. D., Kanaherarachchi, A. C., Renshaw, K. T., Radhakrishnan, S., Hall, G. E., and Broderick, B. M.

Subjects
*PROOF of concept, *PHOTONS, *DESORPTION, *SPECTROMETRY, *ELECTRONS
Abstract

This second paper in a series of two describes the chirped-pulse ice apparatus that permits the detection of buffer gas cooled molecules desorbed from an energetically processed ice using broadband mm-wave rotational spectroscopy. Here, we detail the lower ice stage developed to generate ices at 4 K, which can then undergo energetic processing via UV/VUV photons or high-energy electrons and which ultimately enter the gas phase via temperature-programmed desorption (TPD). Over the course of TPD, the lower ice stage is interfaced with a buffer gas cooling cell that allows for sensitive detection via chirped-pulse rotational spectroscopy in the 60–90 GHz regime. In addition to a detailed description of the ice component of this apparatus, we show proof-of-principle experiments demonstrating the detection of H2CO products formed through irradiation of neat methanol ices or 1:1 CO + CH4 mixed ices. [ABSTRACT FROM AUTHOR]

Published
2024
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5. Buffer gas cooled ice chemistry. I. Buffer gas cell and mm-wave spectrometer.

Author

Radhakrishnan, S., Hager, T., Kanaherarachchi, A., Williams, C., Hall, G. E., and Broderick, B. M.

Subjects
*DATA acquisition systems, *SPECTROMETERS, *ULTRAHIGH vacuum, *TEMPERATURE measurements, *GASES, *ION mobility spectroscopy
Abstract

A new instrument is described that will employ buffer gas cooling with mm-wave rotational spectroscopy (60–90 GHz) to probe molecules desorbed from astrochemical ices prepared in an ultrahigh vacuum environment. Here the design and performance of the buffer gas cell, mm-wave spectrometer and data acquisition system are reported, while application to molecules desorbed from ice surfaces will be described in a future publication. The effective temperature of the neon-cooled buffer gas cell is determined by monitoring a range of rotational lines of propyl cyanide introduced into the cell. Its number density is estimated from comparison to room temperature measurements and the effective collision cross section with neon is estimated by monitoring the free induction decay (FID) lifetimes. The spectrometer and data acquisition system described are capable of acquiring and time–domain averaging the FIDs at 10 Gs/s, 10 bit vertical resolution and 98% duty cycle. [ABSTRACT FROM AUTHOR]

Published
2022
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31. Flow laws for ice sheet modelling: what do experiments tell us?

Author

Prior, D., Bons, P., Cross, A., Durham,W., Fan, S., Goldsby, D., Hager, T., Llorens, Maria-Gema, and Qi, C.

Abstract

Scientific Committee on Antarctic Research (SCAR) Online Conference, August 5, 2020, Researchers are recognising rapid changes occurring at the ice-ocean interface: changes that potentially increase the driving force for sea-ward motion of ice sheets. Estimation of the time-scale of the ice sheet response and resultant sea-level rise depends critically on realistic ice flow laws. Ice deformation is a significant component of ice flow: data from laboratory experiments can be extrapolated to natural strain-rates. The strain rate at a given stress results from the addition of the rates related to grain-size sensitive and grain-size insensitive mechanisms. All ice experiments, where grain-size has been varied, show grain-size dependency at low strain (< 3%). As strain increases to intermediate (~20%) values, viscosity reduces corresponding to changes in fabric and grain-size. At strains higher than 20% to 50% an approximately steady-state viscosity is achieved, corresponding to microstructural steady-state. At low strains, the strain rate dependency on stress (stress exponent: n) depends on ice grain-size and conditions (particularly stress) and varies between ~ 2 and ~ 4. Intermediate n values (3 to 3.5) are common and have little relevance to ice deformation at high strain. Grain-size at steady-state is inversely proportional to the flow stress, through a piezometer relationship. At steady-state, grain-size sensitive mechanisms contribute significantly to deformation, but because the stress controls the grain-size, which in turn controls the viscosity these effects are hidden. Experimental steady-state flow laws have n values of ~ 4 or higher: these are applicable to ice at high strain and match recent estimates from natural systems.

Published
2020

34. Solar-System-Wide Significance of Mars Polar Science

Author

Smith, Isaac, primary, Calvin, W. M., additional, Smith, D. E., additional, Hansen, C., additional, Diniega, S., additional, McEwen, A., additional, Thomas, N., additional, Banfield, D., additional, Titus, T. N., additional, Becerra, P., additional, Kahre, M., additional, Forget, F., additional, Hecht, M., additional, Byrne, S., additional, Hvidberg, C. S., additional, Hayne, P. O., additional, III, J. W. Head,, additional, Mellon, M., additional, Horgan, B., additional, Mustard, J., additional, Holt, J. W., additional, Howard, A., additional, McCleese, D., additional, Stoker, C., additional, James, P., additional, Putzig, N. E., additional, Whitten, J., additional, Buhler, P., additional, Spiga, A., additional, Crismani, M., additional, Aye, K. M., additional, Portyankina, A., additional, Orosei, R., additional, Bramson, A., additional, Hanley, J., additional, Sori, M., additional, Aharonson, O., additional, Clifford, S., additional, Sizemore, H., additional, Morgan, G., additional, Hartmann, B., additional, Schorghofer, N., additional, Clark, R., additional, Berman, D., additional, Crown, D., additional, Chuang, F., additional, Siegler, M., additional, Dobrea, E. N., additional, Lynch, K., additional, Obbard, R. W., additional, Elmaary, M. R., additional, Fisher, D., additional, Kleinboehl, A., additional, Balme, M., additional, Schmitt, B., additional, Daly, M., additional, Ewing, R. C., additional, Herkenhoff, K. E., additional, Fenton, L., additional, Guzewich, S. D., additional, Koutnik, M., additional, Levy, J., additional, Massey, R., additional, Łosiak, A., additional, Eke, V., additional, Goldsby, D., additional, Cross, A., additional, Hager, T., additional, Piqueux, S., additional, Kereszturi, A., additional, Seelos, K., additional, Wood, S., additional, Hauber, E., additional, Amos, C., additional, Russell, P., additional, Jaumann, R., additional, Michael, G., additional, Conway, S., additional, Khayat, A., additional, Lewis, S., additional, Luizzi, G., additional, Martinez, G., additional, Mesick, K., additional, Montabone, L., additional, Johnsson, A., additional, Pankine, A., additional, Phillips-Lander, C., additional, Read, P., additional, Edgar, L., additional, Zacny, K., additional, McAdam, A., additional, Rutledge, A., additional, Bertrand, T., additional, Widmer, J., additional, Stillman, D., additional, Soto, A., additional, Yoldi, Z., additional, Young, R., additional, Svensson, A., additional, Sam, L., additional, Landis, M., additional, Bhardwaj, A., additional, Chojnacki, M., additional, Kite, E., additional, Thomas, P., additional, Plaut, J., additional, Bapst, J., additional, Milkovich, S., additional, Whiteway, J., additional, Moores, J., additional, Rezza, C., additional, Karimova, R., additional, Mishev, I., additional, Brenen, A. Van, additional, Acharya, P., additional, Chesal, J., additional, Pascuzzo, A., additional, Vos, E., additional, Osinski, G., additional, Andres, C., additional, Neisch, C., additional, Hibbard, S., additional, Sinha, P., additional, Knightly, J. P., additional, Cartwright, S., additional, Kounaves, S., additional, Orgel, C., additional, Skidmore, M., additional, MacGregor, J., additional, Staehle, R., additional, Rabassa, J., additional, Gallagher, C., additional, Coronato, A., additional, Galofre, A. G., additional, Wilson, J., additional, McKeown, L., additional, Oliveira, N., additional, Fawdon, P., additional, Gayathri, U., additional, Stuurman, C., additional, Herny, C., additional, Butcher, F., additional, Bernardini, F., additional, Perry, M., additional, Hu, R., additional, Mukherjee, S., additional, Chevrier, V., additional, Banks, M. E., additional, Meng, T., additional, Johnson, P. A., additional, Tober, B., additional, Johnson, J. C., additional, Ulamsec, S., additional, Echaurren, J. C., additional, Khuller, A., additional, Dinwiddie, C., additional, Adeli, S., additional, Henderson, B. L., additional, Lozano, L. R., additional, Lalich, D., additional, Rivera-Valentín, E., additional, Nerozzi, S., additional, Petersen, E., additional, Foss, F., additional, Lorenz, R., additional, Eigenbrode, J., additional, Day, M., additional, Brown, A., additional, Pajola, M., additional, Karatekin, Ö., additional, Lucchetti, A., additional, Cesar, C., additional, Newman, C., additional, Cave, T. G., additional, Tamppari, L., additional, Mischna, M., additional, Patel, M., additional, Streeter, P., additional, Stern, J. C., additional, and Dundas, C. M., additional

Published
2021
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40. 1896MO Volumetric PET response assessment outperforms conventional criteria in patients receiving high-dose pembrolizumab for malignant mesothelioma

Author

Christoph, D.C.C., primary, Barbato, F., additional, Chodyla, M-K., additional, Fendler, W.P., additional, Kessler, L., additional, Pomykala, K.L., additional, Metzenmacher, M., additional, Krefting, F., additional, Hager, T., additional, Herrmann, K., additional, and Ferdinandus, J., additional

Published
2020
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46. Die Analfissur

Author

Hager, T., Braun-Falco, Otto, editor, Plewig, Gerd, editor, and Meurer, Michael, editor

Published
1993
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50. Mass Spectrometry based Methylation Analysis of MDM2, CDKN2A, RB1, TP53 and TP73 and Associations to MDM2 Overexpression in Malignant Pleural mesothelioma

Author

Mairinger, F., Meier, S., Wessolly, M., Köhler, C., Wagner, F., Mairinger, E., Schmeller, J., Borchert, S., Wohlschläger, Jeremias, Plönes, T., Hager, T., Rozynek, P., Kollmeier, J., Christoph, Daniel, Schmid, Kurt Werner, Mairinger, T., Johnen, G., and Walter, R.

Subjects
Medizin, ComputingMethodologies_GENERAL
Abstract

Poster-Abstract

Published
2018

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