IR Studies of Ammonia Hydrates: Effects of Thermal and Radiation Processing

Details IR Studies of Ammonia Hydrates: Effects of Thermal and Radiation Processing IR Studies of Ammonia Hydrates: Effects of Thermal and Radiation Processing

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.4415m&link_type=abstract

American Astronomical Society, DPS meeting #38, #44.15; Bulletin of the American Astronomical Society, Vol. 38, p.566

Physics

Geophysics

Scientific paper

Water- and ammonia-ices have been observed or postulated as important components of Quaoar and Charon and other icy planetary satellites and comets which formed in the outer regions of the protosolar nebula. However, significant gaps exist in our knowledge of the spectra and behavior of such ices under astrophysical conditions. In our laboratory we have undertaken low-temperature spectroscopic studies (1 to 20 microns) of water-ammonia mixtures, with special emphasis on features in the near-IR, a region which is accessible to ground-based observations.
Our laboratory work was completed at NASA Goddard's Cosmic Ice Laboratory where IR spectra of low-temperature ices can be studied as a function of MeV proton bombardment, simulating accumulated cosmic-ray processing. The influences of composition, formation temperature, thermal- and radiation-processing, and phase (crystalline or amorphous) were examined. Conditions for the formation and stability (both radiation and thermal) of two of the three stable ammonia hydrates (NH3:H2O = 2:1 and 1:1) have been completed. We will compare near-IR hydrate spectra with spectra of various water-ammonia ice mixtures, and the spectrum of the ammonium ion. Implications of these results for the formation, stability, and detection of ammonia species on TNOs and within material released from a comet's upper-nuclear region will be presented.
This research is supported through NASA's Planetary Atmospheres and Planetary Geology and Geophysics programs, as well as the NASA Astrobiology Institute's Goddard Center for Astrobiology.

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