Time-dependent Fluorescence Processes of CH, S_2, and C_2H_6 in Comets

Details Time-dependent Fluorescence Processes of CH, S_2, and C_2H_6 in Comets Time-dependent Fluorescence Processes of CH, S_2, and C_2H_6 in Comets

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999dps....31.1706k&link_type=abstract

American Astronomical Society, DPS meeting #31, #17.06

Astronomy and Astrophysics

Astronomy

Scientific paper

When a comet approaches the sun, the nucleus continuously releases molecules. The released molecules are immediately exposed to solar radiation undergoing absorption and emission processes. Short-life molecules do not achieve flourescent equilibrium conditions during their lifetimes. Some long-life molecules also do not achieve steady states, if they have strict selection rules. Therefore, time-dependent fluorescence calculations are necessary to be considered in the analysis of cometary spectra. The lifetimes of CH, S_2, and C_2H_6 are approximately 100, 500, and 100,000 seconds, respectively, at 1 AU from the sun. We will present the time-dependent fluorescence processes of the bands of these molecules and discuss the influence of the fluorescence calculations on the derivations of molecular abundances in comets.

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