Computer Science
Scientific paper
Oct 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982esasp.192...45h&link_type=abstract
In ESA Galactic and Extragalactic Infrared Spectroscopy p 45-46 (SEE N83-18593 08-88)
Computer Science
Deuterium Compounds, Line Spectra, Molecular Clouds, Molecular Rotation, Molecular Spectra, Orion Nebula, Ground State, Infrared Radiation, Interstellar Chemistry, Interstellar Gas, Molecular Collisions, Molecular Excitation, Ratios, Ultraviolet Radiation
Scientific paper
If rotational vibrational levels of HD are excited primarily by collisions, the HD line emission from vibrationally excited levels is approximately 10-4 - 10-3 as strong as the observed H2 line radiation. The ratio is more likely to be 10-3 - 10-2 when comparing emission from levels in the ground vibrational states. However, ultraviolet pumping of HD is probably very important and the HD infrared emissivity is roughly 10-2 - 10-1 that of H2. With the lines from the R and P branches of the rotational-vibrational bands falling in the 2 microns and 3 atmospheric windows, the observation of HD emission is well within the range of present ground based instruments.
Hartquist Thomas W.
Mountain Charles M.
Roueff Evelyne
Selby M. J.
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