Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review
Equilibrium structures have been determined for 19 molecules using least-squares fits involving rotational constants from experiment and vibrational corrections from high-level electronic-structure calculations. Equilibrium structures obtained by this procedure have a uniformly high quality. Indeed, the accuracy of the results reported here likely surpasses that reported in most experimental determinations. In addition, the accuracy of equilibrium structures obtained by energy minimization has been calibrated for the following standard models of ab initio theory: Hartree-Fock, MP2, CCSD, and CCSD(T). In accordance with previous observations, CCSD(T) is significantly more accurate than the other models; the mean and maximum absolute errors for bond distances of the 19 molecules are 0.09 and 0.59 pm, respectively, in CCSD(T)/cc-pCVQZ calculations. The maximum error is obtained for R(OO) in H(2)O(2) and is so large compared with the mean absolute error that an experimental reinvestigation of this molecule is warranted. (C) 2001 American Institute of Physics.
Original language | English |
---|---|
Journal | Journal of Chemical Physics |
Volume | 114 |
Issue | 15 |
Pages (from-to) | 6548-6556 |
Number of pages | 9 |
ISSN | 0021-9606 |
Publication status | Published - 15 Apr 2001 |
See relations at Aarhus University Citationformats
ID: 110780171