Factors contributing to the accuracy of harmonic force field calculations for water

被引:20
作者
Cortez, Michael H.
Brinkmann, Nicole R.
Polik, William F. [1 ]
Taylor, Peter R.
Bomble, Yannick J.
Stanton, John F.
机构
[1] Hope Coll, Dept Chem, Holland, MI 49423 USA
[2] Univ Warwick, Dept Chem, Coventry CV4 7AL, W Midlands, England
[3] Univ Texas, Inst Theoret Chem, Dept Chem, Austin, TX 78712 USA
[4] Univ Texas, Inst Theoret Chem, Dept Biochem, Austin, TX 78712 USA
关键词
D O I
10.1021/ct600347e
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
An analysis of the major factors affecting the accuracy of harmonic force field computations of water is presented. By systematically varying the level of approximation in the basis set, treatment of electron correlation, core electron correlation, and relativistic correction, the underlying sources of error in the computation of harmonic vibrational frequencies for water were quantified. The convergence error due to wavefunction description with a cc-pVQZ basis set in the absence of electron correlation was 1.6 cm(-1), as determined from extending the Hartree-Fock computations to larger basis sets. The convergence error due to neglecting higher-order electronic correlation terms than are included at the CCSD(T) level using the cc-pVTZ basis set was estimated to be 4.7 cm(-1), as determined from frequency calculations up to CCSDTQ for water and literature results up to CCSDTQP for diatomic molecules. The convergence error due to omitting higher-order diffuse functions than included in aug-cc-pVQZ was found to be 3.7 cm(-1), as determined by adding more diffuse functions in larger basis sets. The error associated with neglecting core electron correlation effects (i.e., "freezing" core electrons) was 5.0 cm(-1) and with neglecting relativistic effects was 2.2 cm(-1). Due to a cancellation among these various sources of error, the harmonic frequencies for H2O computed using the CCSD(T)/aug-cc-pVQZ model chemistry were on average within 2 cm(-1) of experimentally inferred vibrational frequencies.
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页码:1267 / 1274
页数:8
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