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Title:LARGE AMPLITUDE MOTIONS IN THE S1 STATE OF ACETALDEHYDE
Author(s):Kasahara, Shunji
Contributor(s):Baba, Masaaki ; Misono, Masatoshi ; NAKAJIMA, KOSUKE ; SHIMIZU, AKIRA
Subject(s):Mini-symposium: Large Amplitude Motions
Abstract:Acetaldehyde is of great interest because of its two large amplitude motions, CH$_{3}$ internal rotation and pyramidal deformation (mainly C-H wagging), and there have been extensive spectroscopic studies so far \footnote{L. H. Xu, J. T. Hougen, R. M. Lees, and M. A. Mekhtiev, {\em J. Mol. Spectrosc.} {\bf 214}, 175 (2002).} \footnote{I. Kleiner, J. T. Hougen, J.-U. Grabow, S. P. Belov, M. Yu. Tretyakov, and J. Cosleou,{\em J. Mol. Spectrosc.}, {\bf 179}, 41 (1996).} \footnote{Y.-C. Chou, C.-L. Huang, I.-C. Chen, C.-K. Ni, and A. H. Kung, {\em J. Chem. Phys.}, {\bf 116}, 1003 (2002).} \footnote{Y.-C. Chou, J. T. Hougen, and I.-C. Chen, {\em J. Chem. Phys.}, {\bf 120}, 2255 (2004).} \footnote{M. Baba, I. Hanazaki, and U. Nagashima, {\em J. Chem. Phys.}, {\bf 82}, 3938 (1985).} \footnote{M. Baba, U. Nagashima, and I. Hanazaki, {\em J. Chem. Phys.}, {\bf 83}, 3514 (1985).}. In order to accurately investigate the vibrational and rotational levels in the $S_{1}(n,\pi*)$ state, rotationally-resolved high-resolution fluorescence excitation spectra were measured by crossing a cw single-mode UV laser beam perpendicular to a collimated molecular beam. The absolute wavenumber was calibrated with accuracy 0.0002 cm$^{-1}$ by measurement of the Doppler-free saturation spectrum of iodine molecule and fringe pattern of the stabilized etalon. The acetaldehyde molecule is pyramidal in the $S_{1}(n,\pi*)$ state, and interactions between the vibrational modes are significant. Our final goal is to perform a global fit of observed rotational transitions and to accurately analyze each interaction.
Issue Date:24-Jun-20
Publisher:International Symposium on Molecular Spectroscopy
Citation Info:APS
Genre:CONFERENCE PAPER/PRESENTATION
Type:Text
Language:English
URI:http://hdl.handle.net/2142/107514
Date Available in IDEALS:2020-06-26


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