DIODE LASER TRANSIENT ABSORPTION SPECTRUM OF THE ETHYL RADICAL

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 Title: DIODE LASER TRANSIENT ABSORPTION SPECTRUM OF THE ETHYL RADICAL Creators: Sears, Trevor J.; Jin, Pei; Johnson, Philip M.; Oatis, Susan Issue Date: 1996 Publisher: Ohio State University Abstract: The $CH_{2}$ rocking fundamental of the ethyl radical, $C_{2}H_{5}$, 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 torsionrotation structure. It has been analysed using a model Hamiltonian based upon a molecular reference structure of $G_{12}$ symmetry. A preliminary analysis of the spectrum has recently been $published,^{1}$ and we report here on subsequent progress. We have employed a slightly refined Hamiltonian and identified several series of R-branch transitions in the $540-550 cm^{-1}$ 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. Description: Acknowledgement: Work at Brookhaven National Laboratory was carried out under Contract No. DE-AC02-76CH00016 with the U. S. Department of Energy and supported by its Division of Chemical Sciences, Office of Basic Energy Sciences. $^{1}$ T. J. Sears, P. M. Johnson, P. Jin and S. Oatis, J. Chem. Phys, 104, 781 (1996). Author Institution: Department of Chemistry, Brookhaven National Laboratory; Department of Chemistry, State University of New York; Department of Chemistry, Long Island University URI: http://hdl.handle.net/1811/13465 Other Identifiers: 1996-MG-13