Abstract
Unidentified diffuse interstellar bands may be caused by electronic transitions of impurity ions in grains which are coupled to the lattice vibrations. The 4430 absorption band has a significantly asymmetric profile, being somewhat steeper on the red side than on the blue. This feature is a prediction of the solid state model proposed for the band.
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WICKRAMASINGHE, N., IRELAND, J., NANDY, K. et al. Origin of the Diffuse Interstellar Bands. Nature 217, 412–415 (1968). https://doi.org/10.1038/217412b0
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DOI: https://doi.org/10.1038/217412b0
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