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Title: Calculations of rovibrational energies and dipole transition intensities for polyatomic molecules using MULTIMODE

Journal Article · · Journal of Chemical Physics
DOI:https://doi.org/10.1063/1.3266577· OSTI ID:1124180
 [1];  [2];  [2];  [3];  [4]
  1. University of Reading 1 Department of Chemistry, , RG6 2AD, England
  2. Emory University 2 Department of Chemistry, Cherry L. Emerson Center for Scientific Computation, , Atlanta, Georgia 30322, USA
  3. Universite Marne la Vallee 3 Laboratoire de Chimie Theorique, , Champs sur Marne F-774250, France
  4. Universita de Bologna 4 Dipartimento di Chimica Fisica ed Inorganica, , Viale Risorgimento 4, Bologna 40136, Italy

We report rigorous calculations of rovibrational energies and dipole transition intensities for three molecules using a new version of the code MULTIMODE. The key features of this code which permit, for the first time, such calculations for moderately sized but otherwise general polyatomic molecules are briefly described. Calculations for the triatomic molecule BF2 are done to validate the code. New calculations for H2CO and H2CS are reported; these make use of semiempirical potentials but ab initio dipole moment surfaces. The new dipole surface for H2CO is a full-dimensional fit to the dipole moment obtained with the coupled-cluster with single and double excitations and a perturbative treatment of triple excitations method with the augmented correlation consistent triple zeta basis set. Detailed comparisons are made with experimental results from a fit to relative data for H2CS and absolute intensities from the HITRAN database for H2CO.

Research Organization:
Emory Univ., Atlanta, GA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
DOE Contract Number:
FG02-07ER54914
OSTI ID:
1124180
Report Number(s):
DOE-Emory-DE-FG02-07ER54914-03; 5-22145
Journal Information:
Journal of Chemical Physics, Vol. 131, Issue 22; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English

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