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Observation of New Bands in theA1Πu–X1Σg+Laser Induced Fluorescence Spectrum of C3

✍ Scribed by Jacob Baker; Simon K. Bramble; Peter A. Hamilton

Publisher: Elsevier Science
Year: 1997
Tongue: English
Weight: 166 KB
Volume: 183
Category: Article
ISSN: 0022-2852
DOI: 10.1006/jmsp.1996.7235

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✦ Synopsis

We report on over 100 new bands of two vibronic types P u -S / g and P g -S / u in the A 1 P u -X 1 S / g laser induced fluorescence spectrum of C 3 in the wavelength range 386-463 nm. A fast electric discharge in the expansion region of a supersonic jet of CO produces rotationally cold but highly vibrationally excited C 3 , although the low frequency bending mode appears to be fully quenched. The vibronic symmetries of the upper and lower states involved in the transitions are in general unambiguously assigned on the basis of the rotational assignment but the apparent lack of ordered vibrational structure in the P g -S / u type transitions makes vibrational assignments for many of these bands ambiguous. Self consistent preliminary assignments for about 30 of the P g -S / u bands allows new vibrational levels in the A state to be characterized.

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