2024-03-29T06:58:55Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/2148332020-12-10T15:37:27Zcom_10261_135com_10261_4col_10261_388
DIGITAL.CSIC
author
Moule, D. C.
author
Bascal, H. A.
author
Smeyers, Y. G.
author
Clouthier, D. J.
author
Karolczak, J.
author
Niño, A.
funder
Natural Sciences and Engineering Research Council of Canada
funder
National Science Foundation (US)
funder
Comisión Interministerial de Ciencia y Tecnología, CICYT (España)
2020-06-19T11:10:10Z
2020-06-19T11:10:10Z
1992-08-30
Journal of Chemical Physics 97: 3964-3972 (1992)
http://hdl.handle.net/10261/214833
10.1063/1.462935
http://dx.doi.org/10.13039/501100000038http://dx.doi.org/10.13039/100000001http://dx.doi.org/10.13039/501100007273
Jet-cooled, laser induced phosphorescence (LIP) excitation spectra of thioacetaldehyde (CH3CHS, CH3CDS, CD3CHS, and CD3CDS) have been observed in the 15 800-17 300 cm-1 region in a continuous pyrolysis jet. The responsible electronic transition, T1 ← S0, ã3A″ ← X̃ 1A′, results from an n → π* electron promotion and gives rise to a pattern of vibronic bands that can be attributed to activity of the methyl torsion and the aldehyde hydrogen out-of-plane wagging modes. Potential and kinetic energy surfaces were mapped out for the aldehyde wagging (α) and the torsional (Θ) internal coordinates by using 6-31G* Hartree-Fock calculations in which the structural parameters were fully relaxed. The potential and kinetic energy data points were fitted to double Fourier expansions in α and Θ and were incorporated into a two-dimensional Hamiltonian operator. The spectrum was simulated from the transition energies and the Franck-Condon factors and was compared to the observed jet cooled LIP spectra. It was concluded that while the RHF procedure gives a good description to the ground state dynamics, the triplet state surface generated by the UHF method is too bumpy and undulating. © 1992 American Institute of Physics.
openAccess
An analysis of the methyl rotation and aldehyde wagging dynamics in the S0 (X̃ 1A′) and T1 (ã3A″) states of thioacetaldehyde from pyrolysis jet spectra
artículo
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URL
https://digital.csic.es/bitstream/10261/214833/1/methyl%20rotation.pdf
File
MD5
aee61f15888d1e7910282b9fd975cf93
1014918
application/pdf
methyl rotation.pdf