Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...338.1047g&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 338, March 15, 1989, p. 1047-1070.
Astronomy and Astrophysics
Astrophysics
32
Carbon, Comet Nuclei, Halley'S Comet, Vibrational Spectra, Energy Levels, Fluorescence, High Resolution, Solar Spectra, Transition Probabilities, Comets, Fluorescence, Excitation, Carbon, Molecules, Equilibrium, Statistical Methods, Density, Energy, Models, Calculations, Rotation, Spectra, Vibration, Rotation, Comparisons, Halley, Comet Nuclei, Parameters, Theoretical Studies, Molecular Processes, Absorption, Emissions, Distribution, Flux, Temperature, Earth-Based Observations, Comae
Scientific paper
The statistical equilibrium equations that determine the population densities of the energy levels in cometary C2 molecules due to fluorescent excitation are examined in detail. The adopted model and molecular parameters are discussed, and a theoretical estimate is made of the two intercombination transition moments. From the theoretical population densities in the various rotational levels, flux ratios and synthetic emission profiles are calculated as functions of the a 3Pi(u) - X 1Sigma(g)+ and the c 3Sigma(u)+ - X 3Sigma(g)+ intercombination transition moments. The influence of each of these two transitions separately on the vibrational and rotational excitation temperatures is investigated. The observed emission spectra of the (0,0) Swan band in Comet Halley are presented and compared to the synthetic profiles.
Black John Harry
Gredel Roland
van Dishoeck Ewine F.
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