On the middle infra-red fluorescence and absorption of molecules in grain mantles

Details On the middle infra-red fluorescence and absorption of molecules in grain mantles On the middle infra-red fluorescence and absorption of molecules in grain mantles

Aug 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....77...66a&link_type=abstract

Astronomy and Astrophysics, vol. 77, no. 1-2, Aug. 1979, p. 66-74.

Astronomy and Astrophysics

Astronomy

53

Astronomical Spectroscopy, Fluorescence, Infrared Absorption, Infrared Astronomy, Interstellar Matter, Optical Pumping, Emission Spectra, F Stars, Infrared Spectra, Molecular Spectra, Shell Stars, Spectral Line Width, Ultraviolet Radiation

Scientific paper

Evidence is presented supporting the assignment of some of the broad mid-IR emission features exhibited by such objects as planetary nebulae and shell stars to the fluorescence of vibrationally excited molecules in grain mantles. Most of the objects exhibiting the mid-IR fluorescence phenomenon are considered, and properties of the fluorescing molecules and their environment are inferred from the strengths and widths of the emission lines. It is shown that the temperature of fluorescing grain mantles may eventually be obtainable from the width of the 3.3-micron methane line, that the characteristic features of the observed mid-IR spectra can be explained in terms of a specific model of UV pumping of the fluorescing molecules, and that even an F star may be capable of pumping this fluorescence. The possibility is considered that unidentified diffuse IR absorption bands may be due in part to radicals frozen into grain mantles.

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