PMID: 11345260May 10, 2001Paper

A fully ab initio potential curve of near-spectroscopic quality for OH- ion: importance of connected quadruple excitations and scalar relativistic effects

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
J M Martin

Abstract

A benchmark study has been carried out on the ground-state potential curve of the hydroxyl anion, OH-, including detailed calibration of both the l-particle and n-particle basis sets. The CCSD(T) basis set limit overestimates omega(e) by about 10 cm(-1), which is only remedied by inclusion of connected quadruple excitations in the coupled cluster expansion--or, equivalently, the inclusion of the 2pi orbitals in the active space of a multireference calculation. Upon inclusion of scalar relativistic effects (-3 cm(-1) on omega(e)), a potential curve of spectroscopic quality (sub-cm(-1) accuracy) is obtained. Our best computed EA(OH), 1.828 eV, agrees to three decimal places with the best available experimental value. Our best computed dissociation energies, D0(OH-) = 4.7796 eV and D0(OH) = 4.4124 eV, suggest that the experimental D0(OH) = 4.392 eV may possibly be about 0.02 eV too low.

References

Feb 1, 1992·The American Journal of Medicine·D A BurackL E Kahl

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Citations

May 13, 2014·Journal of Chemical Theory and Computation·Jan M L Martin, Manoj K Kesharwani
Oct 26, 2002·Physical Review Letters·Christian DelsartChristophe Blondel
Oct 4, 2017·Physical Chemistry Chemical Physics : PCCP·Ming-Jie WanYun-Guang Zhang
Aug 5, 2009·The Journal of Physical Chemistry. a·Benjamin MintzAngela K Wilson
Oct 9, 2019·The Journal of Physical Chemistry. a·Milaim KasNathalie Vaeck

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