Results 261 to 270 of about 95,067 (301)

Vibrational spectroscopy of ice interfaces

Applied Physics B, 2002
Vibrational spectroscopy via infrared-visible sum-frequency generation was used to probe interfaces of hexagonal ice(0001) with vapor, a hydrophobic solid, and a hydrophilic solid. The OH stretch vibrational modes for hydrogen-bonded and free dangling OH bonds were measured at various temperatures below bulk melting.
X. Wei, Y.R. Shen
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VUV Spectroscopy of Extraterrestrial Ices

AIP Conference Proceedings, 2006
Astrochemistry is the study of chemical processes under those conditions prevalent in astronomical environments. Due to the temperatures found in many astrophysical environments much of this chemistry is heterogeneous chemistry occurring within icy mantles found on planetary surfaces, within comets and on dust grains in the interstellar medium.
Mason, N.J., Dawes, A., Holtom, P.D., Mukerji, R.J., Davis, M.P., Sivaraman, B., Kaiser, R.I., Hoffmann, Søren Vrønning; id_orcid 0000-0002-8018-5433, Shaw, D.A.   +8 more
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Amorphous and crystalline ices studied by dielectric spectroscopy

The Journal of Chemical Physics, 2019
This work reports on frequency dependent ambient-pressure dielectric measurements of hyperquenched glassy water, ice IV, ice VI, as well as a CO2-filled clathrate hydrate, the latter featuring a chiral water network. The dipolar time scales and the spectral shapes of the loss spectra of these specimens are mapped out and compared with literature data ...
L. J. Plaga, A. Raidt, V. Fuentes Landete, K. Amann-Winkel, B. Massani, T. M. Gasser, C. Gainaru, T. Loerting, R. Böhmer   +8 more
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VUV photoabsorption spectroscopy of sulfur dioxide ice

Phys. Chem. Chem. Phys., 2006
In this paper we present the first study of the VUV photoabsorption spectrum of condensed phase SO(2) recorded over the VUV region 120 to 320 nm (10.33 to 3.64 eV). Distinct spectral features were observed that can be used to distinguish between the formation of amorphous and crystalline ice structures.
Holtom, P.D., Dawes, A., Mukerji, R.J., Davis, M.P., Webb, S.B., Hoffmann, Søren Vrønning; id_orcid 0000-0002-8018-5433, Mason, N.J.   +6 more
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Analysis of Arctic ices by Remote Raman Spectroscopy

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2011
A portable remote Raman instrument for field analysis has been developed. This instrument has been tested in the Arctic conditions during AMASE (Arctic Mars Analog Svalbard Expedition) campaigns 2007, 2008 and 2009. Besides its capability for mineral detection the remote system proved to be a very useful tool for ice structural analysis of icebergs and
Fernando, Rull, Alberto, Vegas, Antonio, Sansano, Pablo, Sobron   +3 more
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Investigating ultraviolet photoelectron spectroscopy of ice

Solid State Communications, 1979
Abstract Photoelectron energy distribution curves (EDCs) from ice excited by HeI (21.2 eV) and NeI (16.8 eV) radiation are presented. The strict connection between valence density of states and EDCs forces to rule out the previous suggestion by Shibaguchi et al. that conduction band density of states is of paramount importance in determining the EDCs
I. Abbati, L. Braicovich, B. De Michelis
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Ultraviolet Spectroscopy and the Composition of Cometary Ice

Science, 1983
Our current knowledge of the composition of the cometary nucleus is largely inferred from observations of the gas and dust comae that are produced by sublimation of cometary ice when a comet is near the sun. During the past decade, far-ultraviolet spectroscopy from above the terrestrial atmosphere has shed new light on the physics and chemistry of the ...
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The premelting of ice studied with photoelectron spectroscopy

Journal of Physics: Condensed Matter, 2002
We address the century-old puzzle of the existence of a liquid-like layer at the ice surface near its melting point with new photoelectron spectroscopic tools using synchrotron radiation. Near-edge x-ray absorption shows that a liquid-like film exists at temperatures as low as -20 °C. Near 0 °C this film is about 20 A thick, i.e., six bilayers.
Bluhm, H., Ogletree, D., Fadley, C., Hussain, Z., Salmeron, M.   +4 more
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Laboratory Studies of Astronomical Ices: Reaction Chemistry and Spectroscopy

Accounts of Chemical Research, 2020
ConspectusScientists have had evidence for molecules in both comets and interstellar space since the 19th and early 20th centuries. Since then, extraterrestrial molecules ranging from simple diatomics to C70 to amino acids have been detected and identified through remote spectroscopy, spacecraft, and sample return missions. These achievements have been
Christopher K. Materese, Perry A. Gerakines, Reggie L. Hudson   +2 more
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Raman spectroscopy of high salinity brines and ices

Icarus, 2022
Abstract Raman spectroscopy is an ideal tool to analyze the geochemistry and mineralogy of heterogenous mixtures of solids, liquid, and gases in situ, while maintaining planetary protection protocols. Here we characterize saturated CaCl2, MgCl2, MgSO4, Na2SO4, NaCl, and NaClO4 brines, as well as ultrapure water, and mixed MgSO4-NaCl, MgSO4-NaClO4 ...
Daniel P. Mason, Megan E. Elwood Madden
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