Absorption Cross Sections of HCl and DCl at 135-232 Nanometers: Implications for Photodissociation on Venus

Details Absorption Cross Sections of HCl and DCl at 135-232 Nanometers: Implications for Photodissociation on Venus Absorption Cross Sections of HCl and DCl at 135-232 Nanometers: Implications for Photodissociation on Venus

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001apj...559l.179b&link_type=abstract

The Astrophysical Journal, Volume 559, Issue 2, pp. L179-L182.

Astronomy and Astrophysics

Astronomy

11

Planets And Satellites: Individual: Venus, Ultraviolet: Solar System

Scientific paper

Cross sections for photoabsorption of HCl and DCl are determined in the spectral region of 135-232 nm using radiation from a synchrotron light source. At wavelengths near the onset of absorption (λ>200 nm), cross sections of HCl are approximately 5-10 times larger than those of DCl. These data are used to calculate rates of photodissociation of HCl and DCl in the Venusian atmosphere. For the entire wavelength region measured, the rate of photodissociation of DCl is only 16% that of HCl. The difference in rates of photodissociation contributes to the exceptionally large [D]/[H] ratio of the Venusian atmosphere.

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