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Vibrational energies of monodeuterated dimethyl ether based on high level ab initio potential energy surfaces

Authors
Journal
Chemical Physics Letters
0009-2614
Publisher
Elsevier
Publication Date
Volume
592
Identifiers
DOI: 10.1016/j.cplett.2013.12.042
Disciplines
  • Mathematics

Abstract

Abstract Torsion and COC bending vibrational energies for monodeuterated dimethyl ether are reported. A total number of 78 torsion-bending sublevels below 700cm−1 have been obtained using a three dimensional Hamiltonian at a CCSD(T)/aug-cc-VTZ level of theory. Guided by the results obtained for other dimethyl ether isotopologues, the Hamiltonian parameters have been readjusted to obtain a spectrum that is expected to lie closer to future experimental results. In addition to this, a torsional-torsional two dimensional potential has been derived projecting the three dimensional potential energy surface and the torsional barrier height and level splitting magnitudes have also been reckoned.

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