Unsaturated fulleranes and the minor features of the unidentified infrared emission near 3 microns

Details Unsaturated fulleranes and the minor features of the unidentified infrared emission near 3 microns Unsaturated fulleranes and the minor features of the unidentified infrared emission near 3 microns

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.257..463w&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 257, no. 3, Aug. 1, 1992, p. 463-470.

Astronomy and Astrophysics

Astronomy

13

Emission Spectra, Fullerenes, Hydrocarbons, Infrared Spectra, Interstellar Matter, Vibration Mode, Infrared Astronomy, Isomers, Line Spectra, Near Infrared Radiation

Scientific paper

An explanation of the existence of the plateau of emission from 3.4 to 3.6 microns and the weak peaks at 3.46, 3.51, and 3.56 microns in the unidentified infrared emission features is presented in terms of the vibrational transitions of the fulleranes and their ions. It is suggested that the 3.46-micron peak is attributable to aliphatic C-H stretching shifted from the usual wavelength of 3.40 microns by the effect of a vacant site at one of the neighboring carbon atoms. Two neighboring vacant sites have a greater effect and shift the wavelength to give rise to the 3.51-micron line, and three produce the 3.56-micron line. The existence of three peaks is thus a simple consequence of each carbon atom in the fulleranes having three other carbon atoms as nearest neighbors. It is shown that fulleranes with highly symmetrical arrangements of hydrogen atoms can give rise to strong peaks in the spectrum, and a tetrahedral isomer of C60H36 is exhibited with a spectrum, calculated from the present model, which bears a resemblance to that of HD 97048.

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