Abstract
Bond charge, point-dipole models are used to derive simple universal relations,K θθ=0.0435 (K11 K 22)1/2 −0.0086 (K +11 K 22), andK θθ = 0.11 (K 11 K 22)1/2 −0.0055 (K 11 +K 22), between the bond stretching force constantsK 11 andK 22 and bond bending force constantK θθ for linear and bent unsymmetrical triatomic molecules respectively. The relations are shown to be approximately valid for a number of molecules. An extension of the models to include charged species (ions) in triatomic molecules is also presented and tested, giving good results.
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Based on part of a thesis submitted by José L. Gázquez in partial fulfillment of the requirements for the degree of Doctor of Philosophy, The Johns Hopkins University, 1976, and aided by research grants to the Johns Hopkins University and University of North Carolina from the National Institutes of Health and the National Science Foundation.
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Gázquez, J.L., Ray, N.K. & Parr, R.G. Simple electrostatic models for vibrating unsymmetrical triatomic molecules and triatomic ions. Theoret. Chim. Acta 49, 1–11 (1978). https://doi.org/10.1007/BF00552733
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DOI: https://doi.org/10.1007/BF00552733