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Scaling factors for the prediction of vibrational spectra. I. Benzene molecule
Author(s) -
Alcolea Palafox Mauricio
Publication year - 2000
Publication title -
international journal of quantum chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.484
H-Index - 105
eISSN - 1097-461X
pISSN - 0020-7608
DOI - 10.1002/(sici)1097-461x(2000)77:3<661::aid-qua7>3.0.co;2-j
Subject(s) - scaling , benzene , chemistry , displacement (psychology) , computational chemistry , ab initio , ring (chemistry) , molecular physics , molecular vibration , spectral line , molecule , density functional theory , physics , quantum mechanics , mathematics , geometry , organic chemistry , psychology , psychotherapist
The performance of semiempirical, ab initio, and density functional methods in calculating and describing the vibrational frequencies of benzene was determined. Different levels were used. The modes were characterized by the magnitude and direction of the displacement vector. The error in the calculated frequencies was reduced using two procedures to obtain the scaled frequencies. Scaling equations were determined for each theoretical method. Specific scale factors were calculated to reduce the error in the ring modes of benzene derivatives. © 2000 John Wiley & Sons, Inc. Int J Quant Chem 77: 661–684, 2000