Publication: Scaling factors for vibrational frequencies and zero-point vibrational energies of some recently developed exchange-correlation functionals
Issued Date
2006-02-28
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ISSN
01661280
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2-s2.0-33644824304
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Mahidol University
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SCOPUS
Bibliographic Citation
Journal of Molecular Structure: THEOCHEM. Vol.760, No.1-3 (2006), 189-192
Suggested Citation
Yuthana Tantirungrotechai, Ketthip Phanasant, Supacharee Roddecha, Panida Surawatanawong, Vallaya Sutthikhum, Jumras Limtrakul Scaling factors for vibrational frequencies and zero-point vibrational energies of some recently developed exchange-correlation functionals. Journal of Molecular Structure: THEOCHEM. Vol.760, No.1-3 (2006), 189-192. doi:10.1016/j.theochem.2005.12.007 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/23077
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Title
Scaling factors for vibrational frequencies and zero-point vibrational energies of some recently developed exchange-correlation functionals
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Abstract
The scaling factors for the vibrational frequencies and zero-point vibrational energies evaluated at various combinations of recently developed exchange-correlation functionals and various basis sets are reported. The exchange-correlation functionals considered are B972, B98, HCTH, OLYP, O3LYP, G96LYP, PBE0 and VSXC functionals; the basis sets employed are 3-21G, 6-31G*, 6-31G**, 6-31+G, 6-311G*, 6-311G**, 6-311G(df,p), 6-311+G(df,p), cc-pVDZ and aug-cc-pVDZ. The experimental harmonic frequencies of 122 small molecules and the zero-point vibrational energies of 39 small molecules are used to determine the scaling factors through the least-square fitting procedure. It was found that the scaling factors do not depend significantly on the basis sets considered. The vibrational frequency scaling factors evaluated by using the B98 and PBE0 functionals are recommended on the basis of smallest root mean square error. The zero-point vibrational energy scaling factors evaluated from the B972 functional with Pople's double-zeta basis set and the HCTH functional with Pople's triple-zeta basis set are recommended on the basis of smallest root mean square error. © 2006 Elsevier B.V. All rights reserved.