Interstellar Hydrogen Atoms on Graphite Grains

Details Interstellar Hydrogen Atoms on Graphite Grains Interstellar Hydrogen Atoms on Graphite Grains

Aug 1969

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1969natur.223..487m&link_type=abstract

Nature, Volume 223, Issue 5205, pp. 487-488 (1969).

Physics

1

Scientific paper

DULEY1 has recently suggested that the cause of the deficiency of the stellar ultraviolet flux below the Lyman-α line may be due to hydrogen atoms near interstellar grains absorbing at wavelengths shifted from 1216 Å. Duley has calculated the shift in the 1s and 2p levels of an H atom near a pure dielectric grain by placing the atom at the centre of a spherical cavity of radius R0 in a medium specified only by a dielectric constant K. For K = 1.1-->1.4 and R0 = 2-->5a0, the resultant shift in the Lyman-α line is positive, and on the order of a few tenths of an electron volt, so that absorption would occur at wavelengths shorter than 1216 Å.

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