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2009MNRAS.400..291C - Mon. Not. R. Astron. Soc., 400, 291-298 (2009/November-3)
On the action of UV photons on hydrogenated fulleranes C60H36 and C60D36.
CATALDO F. and IGLESIAS-GROTH S.
Abstract (from CDS):
The photolysis of fulleranes with monochromatic light at 245 nm causes a shift of the absorption maximum from 217 nm to longer wavelengths. This band shift of the absorption maximum has already been observed in the photolysis or in the thermal processing of hydrogenated carbon dust. The band shift is due to the release of molecular hydrogen, a process which causes the aromatization of the carbon dust. C60H36 and C60D36 are photolyzed at a rate kC60H36= 2.45x10–3/s while kC60D36= 2.27x10–3/s. This implies an isotope effect so that C60H36 is photolyzed 1.08 times faster than C60D36. In the interstellar medium, this implies a deuterium enrichment of the hydrogenated interstellar carbon dust. The presence of a measurable isotope effect suggests that the photolysis of C60H36 and C60D36involves the rupture of the C-H and C-D bond with release of H2.
C60H36 releases completely hydrogen when heated to 630°C under inert atmosphere producing back C60 as shown by FT-IR spectroscopy. Thus in the interstellar medium an equilibrium should occur between the hydrogenation of C60 with atomic hydrogen and the emission of molecular hydrogen because of the action of UV photons or thermal processing. Interstellar fullerenes and interstellar carbon dust containing fullerenes and fullerene-like structures should play a key role in the formation of molecular hydrogen starting from atomic hydrogen and as carriers of the UV bump of the interstellar extinction curve.
Abstract Copyright: © 2009 The Authors. Journal compilation © 2009 RAS
Journal keyword(s): astrochemistry - molecular processes - dust, extinction - ISM: molecules
Simbad objects: 1
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