Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...123...61c&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 123, no. 1, June 1983, p. 61-66.
Astronomy and Astrophysics
Astronomy
31
Carbon Monoxide, Cometary Atmospheres, Fluorescence, Infrared Astronomy, Microwave Spectra, Molecular Spectra, Molecular Excitation, Molecular Rotation, Vibrational Spectra, Comets, Infrared, Microwaves, Wavelengths, Fluorescence, Carbon Monoxide, Observations, Astronomy
Scientific paper
The excitation of the pure rotation and rotation/vibration lines of the CO molecule in comets is computed at microwave and infrared wavelengths, and which of these lines might be observed from ground-based, high-altitude or space observations is suggested. It is shown that the most important infrared emission of the CO molecule in cometary atmospheres is resonant fluorescence of the (1-0) vibrational band. It is at least two orders of magnitude greater than UV excitation or excitation of other infrared vibrational bands. For most of the CO molecules, the rotational distribution is governed by infrared fluorescence and spontaneous decay; collisions play a role only in the inner coma. The fluorescence equilibrium population distribution deviates significantly from a Boltzmann distribution. The expected intensities of the v(1-0) lines and pure rotation lines are derived.
Crovisier Jacques
Le Bourlot Jacques
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