At the correlation-consistent polarized-valence quadruple-zeta complete active space self-consistent field second-order configuration interaction level of ab initio theory (cc-pVQZ CASSCF-SOCI), we calculated 129 points on the ground electronic state potential energy surface of the water dication H(
Stationary points on the potential energy surface of O2−HF and O2−H2O
✍ Scribed by Jesus P. Lopez
- Publisher
- John Wiley and Sons
- Year
- 1989
- Tongue
- English
- Weight
- 674 KB
- Volume
- 10
- Category
- Article
- ISSN
- 0192-8651
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✦ Synopsis
The determination of minima and saddle points on the potential energy surfaces of the hydrogen bonded species 02-HF and 0,-H20 is performed with unrestricted Hartree-Fock calculations. Geometries, electron density distributions, and relative energies for every stationary point are reported. Only one true minimum is found for 02-HF and for 02-Hz0, and this approximately corresponds to a structure where the partially positive hydrogen atom is located along one of the superoxide ion electron lone-pair directions. Calculated AH, AS, and AG values for the reaction between 0,and H,O are in good agreement with experimental data.
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Previous spectroscopically determined potentials for both H 2 16 O and NO 2 are discussed. It is shown that a recent H 2 16 O potential energy surface due to D. Xie and G. Yan (1996. Chem. Phys. Lett. 248, 409), which was determined by fits to vibrational term values alone and was claimed to be more
## Abstract The ability to use calculated OH frequencies to assign experimentally observed peaks in hydrogen bonded systems hinges on the accuracy of the calculation. Here we test the ability of several commonly employed model chemistries—HF, MP2, and several density functionals paired with the 6‐3