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 Title: Ultrahigh-resolution Laser Spectroscopy Of Acetaldehyde : Torsion-inversion-rotation Interaction In The Excited State Author(s): Nakajima, Kosuke Contributor(s): Baba, Masaaki; Misono, Masatoshi; Kasahara, Shunji; Shimizu, Akira Subject(s): Mini-symposium: Large Amplitude Motions Abstract: Li-Hong Xu, Jon Hougen, Isabelle Kleiner, Jens-Uwe Grabow et al. beautifully analyzed ro-vibrational levels in the ground state of acetaldehyde taking CH$_3$-torsion rotation interaction into consideration \footnote{L.-H. Xu, J. T. Hougen et al., J. Mol. Spectrosc. {\bf 214}, 175 (2002).} \footnote{I. Kleiner, J. T. Hougen, J.-W. Grabow et al., J. Mol. Spectrosc. {\bf 179}, 41 (1996).}. For the lowest electronic excited state S$_1$ $(n\pi^{\star})$ state, the ro-vibrational level structure is much more complicated because of the out-of-plane distorsion in the CHO moiety (tunnel splitting due to double minimum potential) in addition to the profound level structure of CH$_3$ torsion \footnote{M. Baba, I. Hanazaki, and U. Nagashima, J. Chem. Phys. {\bf 82}, 3938 (1985).} \footnote{M. Baba, U. Nagashima, and I. Hanazaki, J. Chem. Phys. {\bf 83}, 3514 (1985).}. We observed and analyzed rotationally resolved ultrahigh-resolution spectra for the S$_1$ $\leftarrow$ S$_0$ transition of jet-cooled aectaldehyde, of which the resolution was much higher than those reported previously \footnote{E. C. Lim, R. H. Judge, D. C. Moule et al., J. Mol. Spectrosc. {\bf 190}, 78 (1998).} \footnote{I.-C. Chen et al., J. Chem. Phys. {\bf 115}, 5089 (2001).}. The effective rotational constant $A_{eff}$ was found to be drastically different between the levels of below and above the barrier to CH$_3$ rotation. We well explained this fact by considering the mechanism of Coriolis interaction and estimating the interaction strength by a model calculation. Issue Date: 2021-06-22 Publisher: International Symposium on Molecular Spectroscopy Genre: Conference Paper / Presentation Type: Text Language: English URI: http://hdl.handle.net/2142/111188 Date Available in IDEALS: 2021-09-24
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