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• W2012590346 abstract "Reduced dimension variational calculations have been performed for the rovibrational level structure of the S1 state of acetylene. The state exhibits an unusually complicated level structure, for various reasons. First, the potential energy surface has two accessible conformers, trans and cis. The cis conformer lies about 2700 cm−1 above the trans, and the barrier to cis-trans isomerization lies about 5000 cm−1 above the trans minimum. The trans vibrations ν4 (torsion) and ν6 (asym. bend) interact very strongly by Darling-Dennison and Coriolis resonances, such that their combination levels and overtones form polyads with unexpected structures. Both conformers exhibit very large x36 cross-anharmonicity since the pathway to isomerization is a combination of ν6 and ν3 (sym. bend). Near the isomerization barrier, the vibrational levels show an even-odd K-staggering of their rotational levels as a result of quantum mechanical tunneling through the barrier. The present calculations address all of these complications, and reproduce the observed K-structures of the bending and C–C stretching levels with good qualitative accuracy. It is expected that they will assist with the assignment of the irregular patterns near the isomerization barrier." @default.
• W2012590346 created "2016-06-24" @default.
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• W2012590346 date "2014-01-13" @default.
• W2012590346 modified "2023-09-27" @default.
• W2012590346 title "Reduced dimension rovibrational variational calculations of the S1 state of C2H2. II. The S1 rovibrational manifold and the effects of isomerization" @default.
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• W2012590346 doi "https://doi.org/10.1063/1.4859876" @default.
• W2012590346 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/24437883" @default.
• W2012590346 hasPublicationYear "2014" @default.
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