The O2/C 3 Delta U - a 1 Delta g/ bands in the nightglow spectrum of Venus

Physics

Scientific paper

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Venus, Spectra, Venera 9, Venera 10, Spectral Bands, Emissions, Airglow, Nightglow, Wavelengths, Atmosphere, Earth

Scientific paper

Recent work by Slanger (1978) on O2 recombination in a flow discharge system has revealed the presence of three O2 band systems, one of which is C 3 Delta u - a 1 Delta g. The question as to why the terrestrial and Venusian oxygen nightglows are so different is discussed. For the former, the A-X (Herzberg I) system is predominant with some contribution from the C-a (Chamberlain) system, whereas the only identified bands on Venus are from the c-X (Herzberg II) system. The observed spectra of Venus provide clear evidence of CO2 quenching of the A 3 Sigma u + and C 3 Delta u states as well as of simultaneous enhancement of the c-X emission. It is shown that the C 3 Delta u - a 1 Delta g bands are the first identified O2 emission that is common to both earth and Venus.

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