Effect of Dimers on the Temperature-Dependent Absorption Cross Section of Methyl Iodide

1996 ◽  
Vol 100 (28) ◽  
pp. 11559-11565 ◽  
Author(s):  
Gabriela C. G. Waschewsky ◽  
Robert Horansky ◽  
Veronica Vaida
Keyword(s):  
Cross Section ◽  
Methyl Iodide ◽  
Absorption Cross Section ◽  
Absorption Cross ◽  
Temperature Dependent ◽  
Dependent Absorption

scholarly journals The H Lyman-<font face="Symbol"><b>a</b></font> actinic flux in the middle atmosphere

2003 ◽  
Vol 3 (1) ◽  
pp. 225-231 ◽  
Author(s):  
T. Reddmann ◽  
R. Uhl
Keyword(s):  
Quantum Yield ◽  
Cross Section ◽  
Absorption Cross Section ◽  
Middle Atmosphere ◽  
Lower Thermosphere ◽  
Resonance Scattering ◽  
Absorption Cross ◽  
Temperature Dependent ◽  
Actinic Flux ◽  
Dependent Absorption

Abstract. The penetration of solar H Lyman-a radiation into the terrestrial middle atmosphere is studied in detail. The Lyman-a actinic flux is calculated with a Monte Carlo approach including multiple resonance scattering of Lyman-a photons within the terrestrial atmosphere and a temperature dependent absorption cross section of molecular oxygen. The dependence of the actinic flux on the temperature profile is significant for O2 column densities greater than about 1024 m-2. For column densities greater than about 5 · 1024 m-2 resonance scattering becomes important at solar zenith angles > 60°. The O(1D) quantum yield of the O2 dissociation by Lyman-a photons is found to decrease from 0.58 in the lower thermosphere to 0.48 in the lower mesosphere. Parameterisations for Lyman-a actinic flux, mean O2 absorption cross section and O(1D) quantum yield including temperature dependence and resonance scattering are given valid up to a O2 column density of about 1025 m-2.

scholarly journals The H Lyman-α actinic flux in the middle atmosphere

2002 ◽  
Vol 2 (5) ◽  
pp. 1635-1654
Author(s):  
Th. Reddmann ◽  
R. Uhl
Keyword(s):  
Quantum Yield ◽  
Cross Section ◽  
Absorption Cross Section ◽  
Middle Atmosphere ◽  
Lower Thermosphere ◽  
Resonance Scattering ◽  
Absorption Cross ◽  
Temperature Dependent ◽  
Actinic Flux ◽  
Dependent Absorption

Abstract. The penetration of solar H Lyman-a radiation into the terrestrial middle atmosphere is studied in detail. The Lyman-a actinic flux is calculated with a Monte Carlo approach including multiple resonance scattering of Lyman-a photons within the terrestrial atmosphere and a temperature dependent absorption cross section of molecular oxygen. The dependence of the actinic flux on the temperature profile is significant for O2 column densities greater than about 1024 m-2. For column densities greater than about 5 · 1024 m-2 resonance scattering becomes important at solar zenith angles > 60°. The \\OD\\ quantum yield of the O2 dissociation by Lyman-aphotons is found to decrease from 0.58 in the lower thermosphere to 0.48 in the lower mesosphere. Parameterisations for Lyman-a actinic flux, mean O2 absorption cross section and \\OD\\quantum yield including temperature dependence and resonance scattering are given valid up to a O2 column density of about 1025 m-2.

Infrared multiphoton decomposition and energy-dependent absorption cross section of chloroethane

1982 ◽  
Vol 86 (5) ◽  
pp. 724-728 ◽  
Author(s):  
Joseph S. Francisco ◽  
Warren D. Lawrance ◽  
Jeffrey I. Steinfeld ◽  
Robert G. Gilbert
Keyword(s):  
Cross Section ◽  
Absorption Cross Section ◽  
Absorption Cross ◽  
Dependent Absorption ◽  
Energy Dependent
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