Triplet transitions of neutral CO in the spectra of comets and the abundance of CO2 or molecules containing the CO group in comets

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Carbon Dioxide, Concentration (Composition), Mrkos Comet, Line Spectra, Molecular Interactions, Ultraviolet Spectra

Scientific paper

The high-dispersion spectra of comet Mrkos (1957 V) taken at Mt. Palomar contain many unidentified weak lines. The possibility that some of these lines belong to transitions between triplet levels of neutral CO molecules is investigated. Their presence suggests excitation related to the dissociative recombination of a parent containing the CO group, which is first ionized by solar UV. Of 31 CO lines (of the Asundi and Triplet systems), 14 are masked by known or by questionably identified lines as statistically expected. Of the remaining 17, 13 coincide within a few tenths of an Angstrom with an unidentified line and 4 do not. These results are contrary to statistical expectations.

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