Absorption lines of interstellar C2 and CN molecules

Details Absorption lines of interstellar C2 and CN molecules Absorption lines of interstellar C2 and CN molecules

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984msngr..38...16v&link_type=abstract

ESO Messenger (ISSN 0722-6691), Dec. 1984, p. 16-19.

Astronomy and Astrophysics

Astronomy

4

Absorption Spectra, Carbon, Cyanogen, Interstellar Matter, Line Spectra, Molecular Clouds, Abundance, Astronomical Spectroscopy, Interstellar Extinction, Molecular Energy Levels, Stellar Spectra

Scientific paper

The European Southern Observatory's Coude Echelle Spectrometer (CES) is one of the finest existing instruments for high resolution studies of the red part of the spectrum. The CES's use for molecule observations may yield valuable information on such physical conditions as temperature and density within interstellar clouds. C2 is an especially important molecule because, being a symmetric species with no permanent dipole moment, its excited rotational levels have long radiative lifetimes and may be highly populated in interstellar clouds by collisional and radiative processes. The CN molecule, which has a permanent dipole moment, would instead be in its ground rotational state.

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