High-resolution spectroscopy of the C2 Swan 0-0 band from Comet P/Halley

Details High-resolution spectroscopy of the C2 Swan 0-0 band from Comet P/Halley High-resolution spectroscopy of the C2 Swan 0-0 band from Comet P/Halley

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...353..640l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 353, April 20, 1990, p. 640-653. Research supported by AAS.

Astronomy and Astrophysics

Astronomy

6

Astronomical Spectroscopy, Carbon, Halley'S Comet, Spectral Bands, Swan Bands, Emission Spectra, High Resolution, Comets, Halley, Spectroscopy, Carbon, Spectra, Temperature, Rotation, Comparisons, Fluorescence, Abundance, Emissions, Earth-Based Observations, Structure, Wavelengths, Intensity, Molecules, Astronomy, Solar Effects, Distance

Scientific paper

High-resolution spectra of the C2 Swan system's 0-0 band from Comet P/Halley in March 1986 show that the populations of the upper state's rotational levels may be described by two rotational temperatures. The low rotational levels provide a low temperature, Trot = about 600 - 700 K. The higher levels correspond to about 3200 K. If a contribution from the 3200-K molecules is subtracted from the populations of the low-J-prime levels, the latter are characterized by Trot = about 190 K. A comparison with recent predictions for C2 molecules fluorescing in sunlight shows that the observed and predicted level populations are in good agreement for J-prime greater than about 15, but there is a sharp disagreement for the low rotational levels.

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