The fluorescence spectrum of the CN radical in comets

Details The fluorescence spectrum of the CN radical in comets The fluorescence spectrum of the CN radical in comets

Sep 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...150..180z&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 150, no. 2, Sept. 1985, p. 180-191.

Astronomy and Astrophysics

Astrophysics

29

Astronomical Spectroscopy, Comets, Cyanogen, Fluorescence, Electron Transitions, Molecular Structure, Radiative Lifetime, Solar Spectra, Vibrational Spectra, Comets, Fluorescence, Spectra, Cyanide, Comparisons, Observations, Models, Parameters, Color, Laboratory Studies, Distance, Velocity

Scientific paper

The complete fluorescence spectrum of the CN radical in comets is computed here for the first time in great detail and compared to observations. The present model takes into account the rotational structure in both the red and violet systems. All parameters entering the model are known from laboratory measurements with the exception of the pure vibration transition rate. A new formalism is developed which allows to ascertain the role of the various parameters. It is shown that the sole violet bands can be used to derive a value for the pure vibration transition rate of about 2.3/s. Then, the structure of both the red and violet bands can be investigated. It is shown that fluorescence accounts for the observations, provided a larger value of the lifetime of the A(v = 0) state than those measured in the laboratory is adopted. Then, fluorescence efficiencies for the main bands of the CN radical are computed as a function of the heliocentric distance and of the radial velocity of the comet. Finally, the Greenstein (1985) effect is quantitatively studied.

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