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Title: What is the ground electronic state of KO?
Authors: Lee, EPF
Soldán, P
Wright, TG
Issue Date: 8-Nov-2002
Source: Journal of chemical physics, 8 Nov. 2002, v. 117, no. 18, p. 8241-8247
Abstract: High-level, restricted coupled cluster with singles, doubles, and perturbative triples calculations are performed to determine the ground electronic state of KO. In the absence of spin–orbit coupling, we find that the ground state is a ²Σ⁺ state, with a² Π state lying just over 200 cm⁻¹ higher in energy. We ascertain that basis set extension, higher-order correlation energy, mass-velocity, and Darwin relativistic terms do not change this ordering. We then calculate the low-lying Ω states when spin–orbit coupling is turned on. The ²Σ⁺ ₁/₂state undergoes an avoided crossing with the 2Π ₁/₂state, and we therefore designate the ground state as X ½. This state is essentially ²Σ⁺ ₁/₂at short R, but essentially 2Π ₁/₂at long R; there is a corresponding A ½ state with the opposite behavior. These states have significantly different shapes and so spectroscopy from the adiabatic states. Finally, we calculate the dissociation energy D ₒ, of KO as 66±1 kcal mol⁻¹ and derive ΔH[sub f](KO, 0 K) as 13.6±1 kcal mol⁻¹.
Keywords: Potassium compounds
Coupled cluster calculations
Ground states
Potential energy surfaces
Energy level crossing
Ab initio calculations
Spin-orbit interactions
Dissociation energies
Relativistic corrections
Publisher: American Institute of Physics
Journal: Journal of chemical physics 
ISSN: 0021-9606
EISSN: 1089-7690
DOI: 10.1063/1.1511179
Rights: © 2002 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in E. P. F. Lee et al., J. Chem. Phys. 117, 8241 (2002) and may be found at http://link.aip.org/link/?jcp/117/8241.
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