Searching for cometary parent molecules at radio wavelengths

Details Searching for cometary parent molecules at radio wavelengths Searching for cometary parent molecules at radio wavelengths

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985aj.....90..670c&link_type=abstract

(International Union of Radio Science, General Assembly, 21st, Florence, Italy, Aug. 31, 1984) Astronomical Journal (ISSN 0004-6

Astronomy and Astrophysics

Astronomy

13

Comets, Molecular Spectra, Radio Astronomy, Ammonia, Carbon Monoxide, Cometary Atmospheres, Fluorescence, Hydrocyanic Acid, Water, Comets, Parent Molecules, Radio Waves, Wavelengths, Microwaves, Models, Infrared, Observations, Thermal Effects, Collisions, Comae, Vibration, Fluorescence, Evolution, Water, Carbon Monoxide, Hydrogen Cyanide, Ammonia, Excitation

Scientific paper

Most cometary parent molecules can only be studied through their rotational lines in the microwave or submillimeter range, or through their vibrational bands in the medium infrared. Recent radio observations of these molecules are reviewed. Their results can only be interpreted if detailed excitation models are worked out. The prevailing excitation mechanisms are thermal excitation by collisions in the inner coma, and infrared excitation of the fundamental bands of vibration followed by fluorescence in the outer coma. The dynamical evolution of molecular excitation must be followed when the molecules expand from the nucleus into the coma. The cases for H2O, CO, HCN, and NH3 molecules are reviewed in more detail and future prospects for radio spectroscopy of comets are indicated.

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