Vibrational computations beyond the harmonic approximation: Performances of the B3LYP density functional for semirigid molecules

The performances of the B3LYP density functional in the computation of harmonic and anharmonic frequencies were tested using 14 standard basis sets of double and triple zeta quality for a set of semirigid molecules containing from 4 to 12 atoms. The quality of the results is assessed by comparison w...

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Bibliographic Details
Published in:Journal of computational chemistry 2005-03, Vol.26 (4), p.384-388
Main Authors: Carbonniere, Philippe, Lucca, Tecla, Pouchan, Claude, Rega, Nadia, Barone, Vincenzo
Format: Article
Language:English
Subjects:
B3LYP density functional
basis sets
Chemical Sciences
Computers
Density
Harmonic analysis
hybrid force fields
Molecules
or physical chemistry
Theoretical and
Vibration tests
vibrational frequencies
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Summary:The performances of the B3LYP density functional in the computation of harmonic and anharmonic frequencies were tested using 14 standard basis sets of double and triple zeta quality for a set of semirigid molecules containing from 4 to 12 atoms. The quality of the results is assessed by comparison with the most reliable computations available in the literature. The study reveals that the relatively cheap 6‐31+G(d,p) basis set performs a very good job for harmonic frequency calculations and that B3LYP anharmonicities are in close agreement with the reference values irrespective of the basis set used. On these grounds “hybrid force fields” are proposed to achieve the best compromise between computer time and quality of the results. © 2005 Wiley Periodicals, Inc. J Comput Chem 26: 384–388, 2005
ISSN:0192-8651
1096-987X
DOI:10.1002/jcc.20170