Astrophysics and Space Science

, Volume 95, Issue 1, pp 209–212 | Cite as

On a vibronic origin for the diffuse band spectrum

  • Joseph A. Nuth
  • Bertram Donn
Letter to the Editor


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. We therefore conclude that this model is not consistent with the observations.


Relative Intensity Interstellar Medium Band Spectrum Wavelength Interval Diffuse Band 
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  1. Duley, W. W.: 1982,Astrophys. Space Sci. 88, 501.Google Scholar
  2. Heger, M. L.: 1922,Lick Obs. Bull. 10, 146.Google Scholar
  3. Herbig, G. H.: 1975,Astrophys. J. 196, 129.Google Scholar
  4. Huffman, D. R.: 1977, inAdvances in Physics 26, 129.Google Scholar

Copyright information

© D. Reidel Publishing Co. 1983

Authors and Affiliations

  • Joseph A. Nuth
    • 1
  • Bertram Donn
    • 1
  1. 1.Laboratory for Extraterestrial PhysicsNASA/Goddard Space Flight CenterGreenbeltUSA

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