The Location of the CO2 Fundamental in Clathrate Hydrates and its Application to Infrared Spectra of Icy Solar System Objects

Details The Location of the CO2 Fundamental in Clathrate Hydrates and its Application to Infrared Spectra of Icy Solar System Objects The Location of the CO2 Fundamental in Clathrate Hydrates and its Application to Infrared Spectra of Icy Solar System Objects

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.7204s&link_type=abstract

American Astronomical Society, DPS meeting #38, #72.04; Bulletin of the American Astronomical Society, Vol. 38, p.629

Physics

Geophysics

Scientific paper

CO2 is present on the surface of many Solar System objects, but not always as a segregated, pure ice. In pure CO2-ice, the fundamental absorption is located near 4.268 μm (2343.3 wavenumbers). However, on several objects, the CO2 fundamental is shifted to higher frequency, (Table 1). This shift may be produced by CO2 gas trapped in another material, or adsorbed onto minerals. We have seen that a mixture of H2O, CH3OH, and CO2 forms a type II clathrate when heated to 125 K and produces a CO2 fundamental near 4.26 μm (Blake, et al. 1991). The exact location of the feature is strongly dependent on the initial ratio of the three components, (Table 1).
We are currently exploring various starting ratios relevant to the Solar System to determine the minimum amount of CH3OH needed to convert all of the CO2 to the clathrate, i.e. eliminate the splitting of the CO2 fundamental. We are testing the stability of the clathrate to thermal processing and UV photolysis, and documenting the changes seen in the spectra in the wavelength range from 1-5 μm. We acknowledge financial support from the Origins of Solar Systems Program, the Planetary Geology and Geophysics and the NASA Postdoctoral Program.
Table 1. Location of CO2 Fundamental in the Solar System and the Laboratory

Object	Lab Sample	Shift of CO2 From 2343.3 cm-1
	H2O:CO2	-4.3,+15.7*
Ganymede		+5.8
Callisto		+5.2
Phoebe		+3.7
Iapetus		+3.7
	H2O:CH3OH:CO2 (100:2.5:1)	+3.3, -3.3*
	H2O:CH3OH:CO2 (100:10:5)	+3.5, -6.1*
	H2O:CH3OH:CO2 (100:50:1)	+2.7

* Splitting of fundamental absorption.
Blake, D. F., L. Allamandola, et al. (1991). "Clathrate hydrate formation in amorphous cometary ice analogs in vacuo." Science 254: 548-551.

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