Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.231..455c&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 231, March 15, 1988, p. 455-463.
Astronomy and Astrophysics
Astronomy
4
Astronomical Spectroscopy, Charge Transfer, Interstellar Matter, Ultraviolet Astronomy, Absorption Spectra, Abundance, Hydrogen Clouds, Metals, Neutral Gases
Scientific paper
It is suggested that the interstellar 2200 Å feature is due to charge transfer between neutral hydrogen and singly ionized iron, silicon and magnesium. Apart from a much weaker feature, near 1600 Å arising from charge transfer between neutral hydrogen and singly ionized aluminium, calcium and sodium, no other charge transfer features should be detectable. The hydrogen and the ions must be together on (or in) the interstellar dust grains. The approximate wavelength of the charge transfer feature for each element is given by the difference in the first ionization potentials of hydrogen and the element, and the approximate strength of each feature by the cosmic abundance of the element. It is further suggested that the diffuse interstellar features observed in the visible are caused by charge transfer between neutral simple molecules that contain hydrogen and ionized common atoms. In particular the 4430 Å feature may arise from charge transfer between CH and Fe+.
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