Results 201 to 210 of about 254,154 (222)
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Raman spectroscopy of high salinity brines and ices
Icarus, 2022Abstract 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 ...
D. P. Mason, Megan E. Elwood Madden
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Spectroscopy and Processing of Interstellar Ice Analogs
AIP Conference Proceedings, 2006Recent results from the Raymond and Beverly Sackler Laboratory for Astrophysics on spectroscopy and processing of interstellar ice analogues are summarized. This includes thermal desorption studies of pure, layered and mixed CO, N2 and O2 ices, and infrared spectroscopy and heating of CO‐CO2, CO‐H2O, CO‐HCOOH, CO‐CH4 and CO‐CH3OH layered and mixed ices.
Stephan Schlemmer +11 more
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Spectroscopy and photochemistry of organic compounds in ice
2020Natural ice and snow are always contaminated by diverse inorganic and organic species, many of which can undergo photochemical transformations under solar radiation or react with photochemically produced reactive species. The courses of these reactions are often phase-specific and strongly depend on many factors, such as phase properties of a frozen ...
Dominik Heger, Petr Klán
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Infrared Spectroscopy of Interstellar Ices [PDF]
, 1996 The development of our understanding of astrophysical ices depends on the interpretation of relevant astronomical observations with the aid of laboratory data for interstellar ice analogues. This paper aims to give an overview of current research, with emphasis on recent results appearing since my previous review of the topic (Whittet, 1993).
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Ultraviolet Spectroscopy and the Composition of Cometary Ice
Science, 1983Our 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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Research in Optical Sciences, 2012
We present experimental 2D IR spectra of the OH stretch of ice Ih, for both the isotope dilute (5% HOD in D2O) and neat (100% H2O) cases, complemented by simulations using the Lippincott-Schroeder model.
Fivos Perakis, Peter Hamm
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We present experimental 2D IR spectra of the OH stretch of ice Ih, for both the isotope dilute (5% HOD in D2O) and neat (100% H2O) cases, complemented by simulations using the Lippincott-Schroeder model.
Fivos Perakis, Peter Hamm
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Analysis of Arctic ices by Remote Raman Spectroscopy
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2011A 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
Alberto Vegas +3 more
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Raman microprobe spectroscopy of icing on metal surfaces [PDF]
Journal of Raman Spectroscopy, 1991 AbstractA simple optical low‐temperature icing cell was fabricated to obtain the in situ Raman spectra of ice layers forming on metallic substrates. The icing cell is optically coupled to a micro Raman multi‐channel spectrometer. The Raman spectra of the initial ice layers show characteristics of a disordered phase resembling low‐density amorphous ice.
S. K. Sharma +2 more
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Partial order in ice VII determined by raman spectroscopy
High Pressure Research, 1992Abstract Raman spectra of ice VII and deuterated ice VII have been determined up to 40 GPa in the diamond anvil cell. These spectra indicate by comparison to those of ice VIII, the ordered form of ice VII, that ice VII is characterized by short range order. The proton order increases up to 12 GPa and then decreases on further compression.
Gauthier, Michel +2 more
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The Journal of Physical Chemistry B, 1997
FT-IR spectroscopic results in conjunction with simulations show that ice nanocrystals, formed at 70 K and annealed at 140 K, consist of a crystalline core, a highly irregular (though relatively smooth) crystalline surface, and a slightly distorted subsurface region connecting the surface and bulklike interior ice.
J. P. Devlin, V. Buch
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FT-IR spectroscopic results in conjunction with simulations show that ice nanocrystals, formed at 70 K and annealed at 140 K, consist of a crystalline core, a highly irregular (though relatively smooth) crystalline surface, and a slightly distorted subsurface region connecting the surface and bulklike interior ice.
J. P. Devlin, V. Buch
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