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Título

Highly correlated ab initio study of the Far Infrared Spectra of Methyl Acetate

Autor Senent, María Luisa ; Domínguez Gómez, R. ; Carvajal, M.; Kleiner, I.
Fecha de publicación 2013
EditorAmerican Institute of Physics
Citación Journal of Chemical Physics 138: 044319 (2013)
ResumenHighly correlated ab initio calculations (CCSD(T)) are used to compute gas phase spectroscopic parameters of three isotopologues of the methyl acetate (CH3COOCH3, CD3COOCH3 and CH3COOCD3), searching to help experimental assignments and astrophysical detections. The molecule shows two conformers cis and trans separated by a barrier of 4457 cm-1. The potential energy surface presents 18 minima that intertransform through three internal rotation motions. To analyze the far infrared spectrum at low temperatures, a three-dimensional Hamiltonian is solved variationally. The two methyl torsion barriers are calculated to be 99.2 cm-1 (C-CH3) and 413.1 cm-1 (O-CH3), for the cis-conformer. The three fundamental torsional band centers of CH3COOCH3 are predicted to lie at 63.7 cm-1 (C-CH3), 136.1 cm-1 (O-CH3) and 175.8 cm-1 (C-O torsion) providing torsional state separations. For the 27 vibrational modes, anharmonic fundamentals and rovibrational parameters are provided. Computed parameters are compared with those fitted using experimental data. © 2013 American Institute of Physics
URI http://hdl.handle.net/10261/103790
DOI10.1063/1.4789413
Identificadoresdoi: 10.1063/1.4789413
issn: 0021-9606
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