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Absorption cross sections of HCl and DCl at 135-232 nanometers: implications for photodissociation on Venus

Bahou, Mohammed and Chung, Chao-Yu and Lee, Yuan-Pern and Cheng, Bing-Ming and Yung, Yuk L. and Lee, L. C. (2001) Absorption cross sections of HCl and DCl at 135-232 nanometers: implications for photodissociation on Venus. Astrophysical Journal Letters, 559 (2). L179-L182. ISSN 2041-8205. https://resolver.caltech.edu/CaltechAUTHORS:20140820-133529847

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Abstract

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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1086/323753DOIArticle
http://iopscience.iop.org/1538-4357/559/2/L179PublisherArticle
http://adsabs.harvard.edu//abs/2001ApJ...559L.179BADSArticle
Additional Information:© 2001 American Astronomical Society. Received 2001 July 6; accepted 2001 August 13; published 2001 September 7. We thank M. Gerstell for useful comments. L. C. Lee thanks the Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, Taiwan, for a visiting professorship. Y. L. Y. acknowledges support by NASA grant NAG5-6263.
Funders:
Funding AgencyGrant Number
NASANAG5-6263
Subject Keywords:planets and satellites: individual (Venus); ultraviolet: solar system
Issue or Number:2
Record Number:CaltechAUTHORS:20140820-133529847
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20140820-133529847
Official Citation:Absorption Cross Sections of HCl and DCl at 135-232 Nanometers: Implications for Photodissociation on Venus Mohammed Bahou et al. 2001 ApJ 559 L179
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48737
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:20 Aug 2014 21:32
Last Modified:03 Oct 2019 07:07

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