Reduced dimension discrete variable representation study of cis-trans isomerization in the S1 state of C2H2
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Author(s)
Baraban, Joshua H.
Beck, A. R.
Steeves, A. H.
Stanton, J. F.
Date Issued
June 2011
Journal
Journal of Chemical Physics
Publisher
American Institute of Physics (AIP)
Citation
Baraban, J. H. et al. “Reduced Dimension Discrete Variable Representation Study of Cis–trans Isomerization in the S1 State of C2H2.” The Journal of Chemical Physics 134.24 (2011): 244311. © 2011 American Institute of Physics
Version
Final published version
Abstract
Isomerization between the cis and trans conformers of the S[subscript 1] state of acetylene is studied using a reduced dimension discrete variable representation (DVR) calculation. Existing DVR techniques are combined with a high accuracy potential energy surface and a kinetic energy operator derived from FG theory to yield an effective but simple Hamiltonian for treating large amplitude motions. The spectroscopic signatures of the S[subscript 1] isomerization are discussed, with emphasis on the vibrational aspects. The presence of a low barrier to isomerization causes distortion of the trans vibrational level structure and the appearance of nominally electronically forbidden [bar-over A][superscript 1]A[subscript 2]←[bar-over X][superscript 1]Σ[subscript g][superscript +] transitions to vibrational levels of the cis conformer. Both of these effects are modeled in agreement with experimental results, and the underlying mechanisms of tunneling and state mixing are elucidated by use of the calculated vibrational wavefunctions.
MIT Department
Massachusetts Institute of Technology. Department of Chemistry
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DOI of Published Version
https://doi.org/10.1063/1.3570823
