Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009apjs..184..361a&link_type=abstract
The Astrophysical Journal Supplement, Volume 184, Issue 2, pp. 361-365 (2009).
Astronomy and Astrophysics
Astronomy
5
Astrochemistry, Methods: Laboratory, Planets And Satellites: General
Scientific paper
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 μm) 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.
Arakawa Masahiko
Fukazawa Hedeto
Kagi Hiroyuki
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