Photoionization of CO2 and photoelectron energy distribution in the atmospheres of Mars and Venus

Details Photoionization of CO2 and photoelectron energy distribution in the atmospheres of Mars and Venus Photoionization of CO2 and photoelectron energy distribution in the atmospheres of Mars and Venus

Jul 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977kosis..15..607d&link_type=abstract

Kosmicheskie Issledovaniia, vol. 15, July-Aug. 1977, p. 607-618. In Russian.

Computer Science

1

Atmospheric Ionization, Carbon Dioxide Concentration, Mars Atmosphere, Photoelectrons, Photoionization, Venus Atmosphere, Electron Density Profiles, Energy Distribution, Troposphere

Scientific paper

The energy distribution of photoelectrons produced during photoionization of CO2 by solar UV radiation in the thermospheres of Mars and Venus is calculated, taking into account various photoionization channels. Essential features of CO2 photoionization are presented in model-independent form as a function of the number of molecules in a column of unit cross section along a photon ray path. The CO2 ionization rate and the formation rate of CO2(+) ions (A2 Pi u, B2 Sigma u /+/) are calculated on the basis of the photoelectron spectrum. Good agreement is obtained between the electron density profile computed by assuming local photochemical equilibrium and an experimentally determined profile as well as between the calculated formation rate of CO2(+) ions (B2 Sigma u/+/) and the experimentally measured emission intensity of the CO2(+) B-X band system.

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