Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9589429 | Journal of Molecular Spectroscopy | 2005 | 7 Pages |
Abstract
IR and Raman spectra of isoxazole and D3-isoxazole are reassigned with the aid of density functional theory calculations at the B3LYP/6-311+G(d,p) level. Harmonic wavenumber values of all non-CH stretch modes give an r.m.s. deviation from experimental values of 3 cmâ1 when they are uniformly scaled by 0.9818. Anharmonic values obtained using a second-order perturbative approach show an r.m.s. deviation of 7.6 cmâ1. Results of equal quality are obtained for D3-isoxazole. Predicted Raman and IR band strengths match experimental spectra very closely. Detailed re-examination of rovibrational constants and inertial defect data from high resolution IR spectra, in comparison with values from the anharmonic frequency calculation, provides confirmation of the vibrational assignments. 'Dark state' fundamentals ν12 (900.2 cmâ1) and ν15 (866 cmâ1) are detected through the perturbations they cause in nearby bands.
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Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
Evan G. Robertson,