Ultraviolet pumping of molecular vibrational states - The CO infrared bands

Details Ultraviolet pumping of molecular vibrational states - The CO infrared bands Ultraviolet pumping of molecular vibrational states - The CO infrared bands

Sep 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...240..940k&link_type=abstract

Astrophysical Journal, Part 1, vol. 240, Sept. 15, 1980, p. 940-949.

Astronomy and Astrophysics

Astronomy

21

Carbon Monoxide, Infrared Astronomy, Molecular Clouds, Optical Pumping, Ultraviolet Absorption, Vibrational Spectra, Fluorescence, Molecular Energy Levels, Optical Thickness, Radiative Transfer, Spectral Bands

Scientific paper

Observable infrared emission from molecular clouds may arise as fluorescence pumped by absorption of ultraviolet photons from a nearby star. General features of such infrared emission are discussed for various diatomic molecules. It is found that the populations of the vibrational levels are commonly described by a single vibrational temperature which is easily estimated for a number of limiting cases. The recent observations of CO overtone bands in Orion are considered in detail to see if the emission could be produced by UV pumping only. It is concluded that both the observed relative intensities of the three bands and also their absolute strengths are inconsistent with such a model.

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