On a vibronic origin for the diffuse band spectrum

Details On a vibronic origin for the diffuse band spectrum On a vibronic origin for the diffuse band spectrum

Sep 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983ap%26ss..95..209n&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 95, no. 1, Sept. 1983, p. 209-212.

Astronomy and Astrophysics

Astrophysics

2

Astronomical Models, Electronic Spectra, Interstellar Extinction, Interstellar Matter, Vibrational Spectra, Chromium, Forbidden Bands, Magnesium Oxides, Spectral Line Width, Transition Probabilities

Scientific paper

Duley (1982) has proposed that many of the diffuse interstellar bands in the wavelength interval 677 nm > λ > 542 nm arise from vibronic transitions of Cr3+ ions in MgO grains. No explanation has been offered for the fact that as many as 85 of the possible 108 transitions of this system have not been observed in the interstellar medium. Moreover, the relative intensities of the diffuse bands which are observed appear to be inconsistent with their assignment. The authors therefore conclude that this model is not consistent with the observations.

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