Diode laser transient absorption spectrum of the ethyl radical

Conference · Tue Dec 31 04:00:00 EST 1996

OSTI ID:437214

Sears, T J; Jin, Pei ^[1]; Johnson, P M ^[2]

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1. Brookhaven National Lab., Upton, NY (United States)
2. State Univ. of New York, Stony Brook, NY (United States); and others

The CH{sub 2} rocking fundamental of the ethyl radical, C{sub 2}H{sub 5}, has been observed at wavelengths close to 18.9 microns. The spectrum shows evidence for a very low barrier to internal rotation, or torsion, and exhibits complex torsion-rotation structure. It has been analysed using a model Hamiltonian based upon a molecular reference structure of G{sub 12} symmetry. A preliminary analysis of the spectrum has recently been published, and the authors report here on subsequent progress. The authors have employed a slightly refined Hamiltonian and identified several series of R-branch transitions in the 540-550 cm{sup -1} region. They are thought to derive from levels belonging to non-degenerate symmetry species. Such levels contain the the most easily accessible information on the size of the torsional potential in the spectrum and confirmed assignments should enable an improved determination of the torsional potential as well as structural parameters.

• Research Organization: Brookhaven National Laboratory (BNL), Upton, NY
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 437214
• Report Number(s): CONF-9606118--
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
ABSORPTION SPECTROSCOPY
ETHYL RADICALS
HAMILTONIAN FUNCTION
LASER SPECTROSCOPY
MATHEMATICAL MODELS
ROTATIONAL STATES
VIBRATIONAL STATES