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Diffuse interstellar bands (DIB): co-planar doubly excited He and metal atoms embedded in Rydberg Matter

Journal article
Authors Leif Holmlid
Published in Astrophysics and Space Science
Volume 336
Pages 391–412
Publication year 2011
Published at Department of Chemistry
Pages 391–412
Language en
Keywords ISM: lines and bands, ISM: molecules, Line: formation, Line: identification
Subject categories Space physics, Mesoscopic physics, Astronomy, Astrophysics and Cosmology, Galactical astronomy


The interpretation of the more than 300 diffuse interstellar bands (DIBs) is one of the most long-standing problems in interstellar spectra since the two first bands were reported in 1921. We now predict the frequencies of 260 diffuse interstellar bands (DIBs) using the Rydberg Matter model we have developed previously. These transitions involve mainly He atoms, but other two-electron atoms like Ca and other metals can take part in the absorption processes. Approximately 70% of the total intensity of the DIBs is due to absorption in doubly excited states and 30% in singly excited He atoms. The doubly excited states are in inverted states while the He atoms are thermal. The possibilities to observe DIBs in the UV and NIR ranges are discussed and band positions are predicted.

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