Laboratory Measurements of Infrared Absorption Spectra of Hydrogen-ordered Ice: A Step to the Exploration of Ice XI in Space

Infrared absorption spectra of ice were obtained at 4, 60, 100, 140, 160, and 240 K to make spectroscopic observations of hydrogen ordering at low temperatures. A broad peak observed at around 850 cm-1 (11.7 Delta *mm) was derived from libration of water molecules. The peak width was notably narrowe...

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Published inThe Astrophysical journal. Supplement series Vol. 184; no. 2; pp. 361 - 365
Main Authors Arakawa, M, Kagi, H, Fukazawa, H
Format Journal Article
LanguageEnglish
Published IOP Publishing 01.10.2009
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Summary:Infrared absorption spectra of ice were obtained at 4, 60, 100, 140, 160, and 240 K to make spectroscopic observations of hydrogen ordering at low temperatures. A broad peak observed at around 850 cm-1 (11.7 Delta *mm) was derived from libration of water molecules. The peak width was notably narrower at temperatures less than 140 K. A decrease in the peak width occurring in accordance with the formation of ice with ordered arrangements of hydrogen atoms was suggested from incoherent inelastic neutron-scattering studies. These results are consistent with ordering of hydrogen atoms. The existence of hydrogen-ordered ice in space is the subject of continuing astronomical debate. Our results demonstrate that ordered ice in space is detectable using infrared telescopes and planetary exploration.
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ISSN:0067-0049
1538-4365
DOI:10.1088/0067-0049/184/2/361