Physics
Scientific paper
Jan 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jgr....80..161m&link_type=abstract
Journal of Geophysical Research, vol. 80, Jan. 1, 1975, p. 161-167.
Physics
8
Atmospheric Composition, Carbon Monoxide, Dayglow, Electron Impact, Mars Atmosphere, Atmospheric Ionization, Carbon Dioxide, Electromagnetic Absorption, Emission Spectra, Gas Dissociation, Line Spectra, Molecular Rotation
Scientific paper
Measurements were made of the rotational profiles of specific bands of the CO fourth-positive group (4PG). The CO 4PG bands were excited by electron impact dissociative excitation of CO2. The results are applicable to analysis of the Mariner observations of the CO 4PG in the dayglow of Mars. The results indicate that dissociative excitation of CO2 by electron impact leads to CO(A 1Pi) fragments with a rotational distribution that is highly nonthermal. The parent CO2 temperature was about 300 K in the experiment, while the fragment CO(A 1Pi) showed emission band profiles consistent with a rotational temperature greater than about 1500 K. Laboratory measurement of the reduced transmission of the hot bands by thermal CO appears to be the most direct way of determining the column density responsible for the CO(v',0) absorption of Mars.
Mumma Michael J.
Stone E. J.
Zipf Edward C.
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