# ANALYSIS OF THE HIGH-RESOLUTION JET-COOLED FLUORESCENCE EXCITATION SPECTRA OF THE HIGHER LEVELS IN THE 29 $769 CM^{-1}$ BAND SYSTEM OF ACETALDEHYDE: FURTHER REFINEMENTS OF THE TORSION-INVERSION POTENTIAL CONSTANTS.

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 Title: ANALYSIS OF THE HIGH-RESOLUTION JET-COOLED FLUORESCENCE EXCITATION SPECTRA OF THE HIGHER LEVELS IN THE 29 $769 CM^{-1}$ BAND SYSTEM OF ACETALDEHYDE: FURTHER REFINEMENTS OF THE TORSION-INVERSION POTENTIAL CONSTANTS. Creators: Liu, H.; Lim, E. C.; Munoz-Caro, C.; Nino, A.; Judge, R. H.; Moule, D. C. Issue Date: 1997 Publisher: Ohio State University Abstract: Acetaldehyde molecules in the first singlet excited state contain two coupled low frequency vibrational modes, $\nu_{14}$ (inversion) and $\nu_{15}$ (torsion). In an earlier paper, $^{m}$ a two dimensional least squares analysis of the first seven bands in the UV spectrum of acetaldehyde jet-cooled vapor gave an excited state barrier to inversion of $585.13 cm^{-1}$ and a torsional barrier of $721.43 cm^{-1}$. A discussion of the results of a vibrational and rotational analysis of 12 additional bands beyond this earlier analysis will be presented. The assignment of the $14^{2}_{0}$ band has changed and the inclusion of the higher members of the torsional mode has given refined values for the barriers. Description: $^{m}$H. Liu, E. C. Lim, C. MunToz-Caro, A. NinTo, R. H. Judge and D. C. Moule, J. Mol. Spectrosc., 175, 172-189 (1996). Author Institution: Department of Chemistry, University of Akron; E.U. NiNo, Inform\`{a}tica Universidad de Castilla-La Mancha, Ronda de Calatrava 5, 13071 Ciudad Real, Spain; Department of Chemistry, University of Wisconsin-Parkside; Department of Chemistry, Brock University URI: http://hdl.handle.net/1811/14000 Other Identifiers: 1997-RI-04