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 00:00:00 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]

---

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), Vol. 7:9; ISSN 0740-3224
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
02 PETROLEUM
CARBON
FLUORESCENCE SPECTROSCOPY
PETROLEUM
CHEMICAL ANALYSIS
ANGULAR MOMENTUM
BENDING
ELECTRON SPECTRA
GROUND STATES
INFRARED SPECTRA
JETS
OPTICAL PUMPING
VIBRATIONAL STATES
ELEMENTS
EMISSION SPECTROSCOPY
ENERGY LEVELS
ENERGY SOURCES
EXCITED STATES
FOSSIL FUELS
FUELS
NONMETALS
PUMPING
SPECTRA
SPECTROSCOPY
400201* - Chemical & Physicochemical Properties
023000 - Petroleum- Properties & Composition