H2 as a possible carrier of the DIBs?

W. Ubachs*

*Corresponding author for this work

Research output: Contribution to JournalArticleAcademicpeer-review


In the 1990s the hydrogen molecule, by far the most abundant molecular species in the interstellar medium, has been proposed as a possible carrier of the diffuse interstellar bands. While some remarkable coincidences were found in the rich spectrum of inter-Rydberg transitions of this molecule with DIB-features, both in frequency position as in linewidth, some open issues remained on a required non-linear optical pumping scheme that should explain the population of certain intermediate levels and act as a selection mechanism. Recently a similar scheme has been proposed relating the occurrence of the UV-bump (the ubiquitous 2170 Å extinction feature) to the spectrum of H2, therewith reviving the H2 hypothesis.

Original languageEnglish
Pages (from-to)375-377
Number of pages3
JournalProceedings of the International Astronomical Union
Issue numberS297
Publication statusPublished - Feb 2014


  • extinction
  • H
  • ISM: molecules
  • radiation mechanisms: nonthermal


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