Infrared fluorescence of molecules in comets - The general synthetic spectrum

Details Infrared fluorescence of molecules in comets - The general synthetic spectrum Infrared fluorescence of molecules in comets - The general synthetic spectrum

Sep 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...126..170c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 126, no. 1, Sept. 1983, p. 170-182.

Astronomy and Astrophysics

Astrophysics

67

Abundance, Comets, Infrared Spectra, Molecular Spectra, Resonance Fluorescence, Cometary Atmospheres, Cosmochemistry, Data Simulation, Molecular Excitation, Solar Radiation, Vibrational Spectra

Scientific paper

In order to prepare infrared observations of comets from the earth or from fly-by probes, 130 vibration-rotation bands of 20 possible parent molecules are listed, and their plausible excitation mechanisms are considered. It is shown that the main emission process is expected to be resonant fluorescence of the fundamental vibrational bands by direct solar excitation. Other excitation mechanisms are only marginal, with the exception of dust excitation and collisions that may compete with solar excitation in the inner coma for the longest wavelength bands. On the assumption of plausible chemical compositions, computations are made of synthetic spectra in the 2.5-16 micron range. The best candidates for detection from a fly-by probe with a medium-resolution spectrometer are H2O, CO, CO2, CH4, H2CO, and NH3. It is pointed out that with a high-resolution spectrometer, some of these species might also be observable from the ground.

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