Identification of some diffuse interstellar features

Details Identification of some diffuse interstellar features Identification of some diffuse interstellar features

Dec 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982ap%26ss..88..501d&link_type=abstract

Astrophysics and Space Science, vol. 88, no. 2, Dec. 1982, p. 501-505. Research supported by the Natural Sciences and Engineeri

Astronomy and Astrophysics

Astronomy

6

Astronomical Spectroscopy, Diffuse Radiation, Infrared Astronomy, Interstellar Matter, Vibrational Spectra, Electron Transitions, Magnesium Oxides, Spectral Bands, Spectral Line Width

Scientific paper

An examination of Herbig's (1975) 39 diffuse interstellar bands has identified 28 which constitute three vibronic systems, originating at 14321, 15153 and 15343/cm, whose structure arises from the excitation of vibrational modes with v(1) = 275/cm, v(2) = 445.5/cm, and v(3) = 793/cm. While the electronic origins at 14321 and 15343/cm correspond to narrow lines observed in the spectrum of Cr(3+) ions in MgO-solids cubic sites, the 15153/cm origin arises in Mn(4+):MgO, indicating the likelihood that many of the diffuse bands in the visible are due to small MgO particles containing these ions. This is compatible with recent experimental data whose broad bands at 160 and 220 nm, from finely divided MgO solids, match features in the interstellar extinction curve.

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