The Vibrations of C/60H/60 and the Unidentified Infrared Emission

Details The Vibrations of C/60H/60 and the Unidentified Infrared Emission The Vibrations of C/60H/60 and the Unidentified Infrared Emission

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.264..121w&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 264, NO. 1/SEP1, P. 121, 1993

Astronomy and Astrophysics

Astronomy

17

Line: Formation - Line: Identification - Molecular Processes - Ism: Molecules - Infrared: Interstellar: Lines

Scientific paper

A theoretical study is presented of the vibrations of C60H60, the saturated hydride of the soccerball molecule C60, and the results are compared with features in the spectrum of the unidentified infrared emission. A simple force-field model with standard constants is adopted for C60H60, and also for the laboratory species C20H20 as a check. The properties of the nine active vibrations of the model of C60H60, and the distribution over frequency of all the vibrations, are given. The wavelengths of several of the active modes are found to lie within a few per cent of those of features known in the unidentified infrared emission. An outstanding characteristic of the model is the large number of modes associated with the rocking of C-H units; the number density of these modes has a broad peak between 6 and 10 μm that is not unlike the `6-9 μm plateau', the strongest feature in the unidentified infrared emission. The vibrational frequencies of the model extend only as low as 216 cm-1 (46 μm), and this finding is compared with the properties of the infrared cirrus discovered by IRAS.

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