Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.247..647d&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 247, Dec. 15, 1990, p. 647-650. NSERC-supported researc
Astronomy and Astrophysics
Astronomy
28
Amorphous Materials, Carbon, Hydrogenation, Interstellar Matter, Photoluminescence, Energy Gaps (Solid State), Hydrogen Atoms, Interstellar Chemistry, Photodissociation
Scientific paper
Rehydrogenation of amorphous carbon is known to occur in the laboratory, and is accompanied by an increase in the band-gap energy to values in excess of 2 eV. The extent to which rehydrogenation can occur for interstellar amorphous carbon grains in regions of high excitation is discussed. It is shown that rehydrogenation should be a rapid process in zones near bright stars where H2 photodissociation occurs, with the consequence that rehydrogenated grains will luminesce efficiently in the red. The ultimate fate of such grains is explored. The nature and the properties of grains in the Red Rectangle are predicted, and it is shown that amorphous carbon grains in the typical diffuse interstellar medium do not undergo rehydrogenation. Observable diagnostics of these grain evolutions are proposed.
Duley Walter W.
Williams David. A.
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