Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.263..385w&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Vol. 263, NO.2/JUL15, P. 385, 1993
Astronomy and Astrophysics
Astronomy
17
Molecular Processes - Ism: Molecules Bibliographic Code: 1993Mnras.263..385W
Scientific paper
A theory in which the diffuse interstellar bands are carried by the fulleranes C60Hm (m = 1,2..., 60) and their ions is investigated further The molecules of this series have a variety of π-electron systems which are here assigned to two categories by size: global systems, which involve most of the carbon atoms in the molecule, and local systems, which involve only a few. Known differences in the spatial distribution of interstellar bands of different width then suggest that the narrow bands are carried by global systems while the broad bands are carried by local systems. Considerations of the width of the profile suggest that each narrow band would probably originate in a global system on a unique isomer of a particular hydride. There are so many different isomers of most of the hydrides that, if they are all equally common, any one of them will be too scarce to detect, and it seems necessary to suppose that the narrow bands are carried either by magic isomers which are overabundant in the population, or by species such as C60H2 which have few isomers. The broad bands would originate in small parts of molecules which may be radicals. The equivalent width of λ4430 from the theory is found to be greater than the observed value unless the oscillator strength is taken to be small or the abundance is taken to be low. According to the new theory, observable correlations are expected between the variable component of the extinction and the diffuse interstellar bands, because both are carried by the fulleranes.
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