Abstract
Several possible identifications for the diffuse interstellar lines are reviewed. The strong correlation of diffuse-line strength and of interstellar extinction in the continuum, as well as the break in the extinction curve close to the wavelength of the strongest diffuse line (4430 Å), indicates that the absorber is closely associated with the solid particles. Possibly a molecule frozen on or in the grains may be responsible. Other possibilities considered include a negative ion with 2.8 eV as ionization limit, and free polyatomic molecules.
Publisher
Cambridge University Press (CUP)
Cited by
3 articles.
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