Other
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000dps....32.6534w&link_type=abstract
American Astronomical Society, DPS Meeting #32, #65.34; Bulletin of the American Astronomical Society, Vol. 32, p.1646
Other
1
Scientific paper
Using synchrotron radiation as a continuum light source, we have carried out the following measurements of the absolute photoabsorption cross sections of 1) Gaseous H2O and D2O in the 155-190 nm region at temperatures of 295 K and 370 K. 2) Liquid H2O and D2O in the 170-187 nm and 165-180 nm regions, respectively, at 295 K. 3) Gaseous C6H6 (benzene) in the 225.0-270 nm region at 295 K and 370 K. 4) Liquid C6H6 in the 230-270 nm region at 295 K. Significant isotopic shifts in the spectra and temperature effects in the cross section values of these molecules are observed. The laboratory results will be presented. There is strong evidence that a warmer past climate on Mars permitted liquid water near its surface [e.g., Carr, 1996; McElroy and Yung, 1976]. The D/H isotopic enrichment on Mars was discovered by Owen et al. [1988]. The temperature dependent absorption cross sections of the gaseous and liquid water may provide important data on the photochemical processes that have modified the Martian atmosphere over time. HST observational data of the atmosphere of Jupiter reveal a difference auroral and non-auroral UV absorption spectra [e.g., Carlson, 1997]. This has strengthened the idea that there is connection between aerosol formation/hydrocarbon chemistry and the aurora. The spectral dependence of this absorption suggests enhancements of the high order hydrocarbon, benzene, C6H6. A search for confirmation of benzene in absorption in the UV is crucial in modeling the formation and dynamics of the polar haze on Jupiter. The earlier observation of C6H6 in the solar system refers to the poles of Jupiter [Kim et al., 1985]. The C6H6 was definitely enhanced at the pole with respect to lower latitudes in the Infrared emissions at 16 micron (close to but distinct from CO2). If one can verify that C6H6 is indeed concentrated at the poles, that might indicate that the detailed polymer reactions are different at different latitudes, such that cyclic molecules are formed from radiolysis, and perhaps other kinds from photolysis [Carlson, 1997; Caldwell, private communication, 1997].
Chen Fangpei
Judge Darrell
Wu Rebing
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