Absorption Cross Sections of HC[CLC]l[/CLC] and DC[CLC]l[/CLC] at 135–232 Nanometers: Implications for Photodissociation on Venus | Zendy

Mohammed Bahou | Zendy; Chao-Yu Chung | Zendy; YuanPern Lee | Zendy; BingMing Cheng | Zendy; Yuk L. Yung | Zendy; L. C. Lee | Zendy

Open Access

Absorption Cross Sections of HC[CLC]l[/CLC] and DC[CLC]l[/CLC] at 135–232 Nanometers: Implications for Photodissociation on Venus

Author(s) -

Mohammed Bahou,

Chao-Yu Chung,

YuanPern Lee,

BingMing Cheng,

Yuk L. Yung,

L. C. Lee

Publication year - 2001

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/323753

Subject(s) - photodissociation , wavelength , physics , absorption (acoustics) , atmosphere (unit) , synchrotron radiation , venus , atomic physics , optics , photochemistry , chemistry , astrobiology , thermodynamics

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 ( nm), cross l 1 200 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. Subject headings: planets and satellites: individual (Venus) — ultraviolet: solar system

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