Other
Scientific paper
Mar 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aps..marn13001m&link_type=abstract
American Physical Society, Annual March Meeting, March 12 - 16, 2001 Washington State Convention Center Seattle, Washington Meet
Other
Scientific paper
Non-thermal DIET processes at surfaces (desorption induced by electronic transitions) may affect both terrestrial and planetary atmospheres. One case concerns observations of neutral sodium and potassium vapor in the tenuous atmospheres of the planet Mercury and the Moon, as well as Jupiter's icy satellite, Europa. In a series of model experiments, we find strong evidence that non-thermal processes - mainly photon-stimulated desorption (PSD) by UV photons - play a dominant role in desorption of Na atoms from the lunar surface, and may affect Na and K in the other atmospheres also. The second case involves measurements that may impact on understanding the destruction of ozone-depleting chlorofluorocarbons (CFCs) in the earth's upper atmosphere, via electron-induced processes on ice particles in polar stratospheric clouds. We observe giant Cl^- and F^- enhancements by several orders of magnitude in electron-stimulated desorption (ESD) of a fractional monolayer of CF_2Cl2 coadsorbed with water ice and ammonia ice on a metal surface at ~25 K, respectively. The negative-ion enhancements are attributed to dissociation of CF_2Cl2 by capture of low-energy secondary electrons trapped by coadsorbed polar water or ammonia.
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