Stimulated-emission pumping spectroscopy study of jet-cooled C sub 3 : pure bending levels and bend--symmetric-stretch combination levels of tilde X sup 1. Sigma. sup + sub g

Journal Article · Sat Sep 01 04:00:00 EDT 1990 · Journal of the Optical Society of America, Part B: Optical Physics; (USA)

DOI:https://doi.org/10.1364/JOSAB.7.001924· OSTI ID:6286659

Northrup, F J; Sears, T J ^[1]

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1. Department of Chemistry, Brookhaven National Laboratory, Upton, NY (USA)

Stimulated-emission pumping spectra were recorded for many pure bending levels ((0, 2, 0)--(0, 34, 0)) and bend-- symmetric-stretch combination levels ((1, 0, 0)--(1, 8, 0) and (3, 4, 0)--(3, 8, 0)) in the {ital {tilde X}} {sup 1}{Sigma}{sup +}{sub {ital g}} state of C{sub 3} following excitation of transitions in the {ital {tilde A}} {sup 1}{Pi}{sub {ital u}}--{ital {tilde X}} {sup 1}{Sigma}{sup +}{sub {ital g}} band system. Rotational levels to {ital J}=16 were probed and, because of strong mixing of vibrational angular momentum components, levels with {ital l} up to 8 were observed. A rotational analysis was carried out by means of a simple rigid-rotor harmonic-oscillator model for a linear molecule. An adequate fit was obtained, showing that all these vibrational levels could be described by a linear average geometry even though the bending vibration is known to be of extremely large amplitude. {ital B}{sub {ital v}} was found to increase strongly with {ital v}{sub 2} and to decrease with excitation in {nu}{sub 1}. Interpretation of the physical meaning of the resulting parameters is difficult, however, since the vibrational potential is not well described by a harmonic oscillator.

• OSTI ID: 6286659
• Journal Information: Journal of the Optical Society of America, Part B: Optical Physics; (USA), Journal Name: Journal of the Optical Society of America, Part B: Optical Physics; (USA) Vol. 7:9; ISSN JOBPD; ISSN 0740-3224
• Country of Publication: United States
• Language: English

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