Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000mnras.313l..14s&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 313, Issue 1, pp. L14-L16.
Astronomy and Astrophysics
Astronomy
9
Molecular Processes, Stars: Individual: Hd 183143, Dust, Extinction, Ism: Molecules
Scientific paper
It is proposed that some, possibly many, of the unidentified diffuse interstellar absorption bands arise from rovibronic transitions between the ground states of negatively charged molecules and/or small grains, and shallow dipole-bound electronic states which lie close to the electron detachment threshold. Under this hypothesis the attributes for the neutral `molecular' frameworks are electron affinities between 1 and 3eV and permanent electric dipole moments of ~2 debye or greater. Bound-bound spectra involving the lowest rotational levels have not been detected in the laboratory, but these proposed carriers appear to be capable of satisfying the main observational astronomical constraints: transitions that lie in the range from the near-ultraviolet to the near-infrared; a wide range of widths; band wavelengths that are invariant; and a large number of related but distinct carriers. The wavelengths of the lowest rotational lines of the 000 band of the transition between the ground and a dipole-bound electronic state of the CH2CN- molecule appear to be consistent with a diffuse band near 8037Å.
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