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# DIODE LASER TRANSIENT ABSORPTION SPECTRUM OF THE ETHYL RADICAL

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/13465

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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 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. URI: http://hdl.handle.net/1811/13465 Other Identifiers: 1996-MG-13