Vibrational excitation of H2 in intense ultraviolet fluxes

Details Vibrational excitation of H2 in intense ultraviolet fluxes Vibrational excitation of H2 in intense ultraviolet fluxes

Feb 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...219..877s&link_type=abstract

Astrophysical Journal, Part 1, vol. 219, Feb. 1, 1978, p. 877-885.

Astronomy and Astrophysics

Astrophysics

71

Hydrogen, Interstellar Gas, Interstellar Masers, Molecular Excitation, Molecular Oscillations, Ultraviolet Radiation, Line Spectra, Optical Pumping, Radiative Transfer, Vibrational Spectra

Scientific paper

The vibrational excitation of H2 in intense ultraviolet radiation fields is studied. The radiative cascade through bound levels of the ground electronic state, following absorption of Lyman- and Werner-band photons, is modified to include effects of 'multiple pumping' and direct photodissociation from the high vibrational levels. Although the column densities in the excited vibrational levels produced by UV pumping appear too low to explain the recently observed Orion quadrupole emission lines, it is suggested that the far-red lines in the (3-0) and (4-0) bands, produced by UV pumping from O stars near dense molecular clouds, may be detectable.

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