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Vibration--rotation--tunneling dynamics calculations for the four-dimensional (HCl)2 system: a test of approximate models.
Elrod, M J; Saykally, R J.
Affiliation
  • Elrod MJ; Department of Chemistry, University of California, Berkeley 94720, USA.
J Chem Phys ; 103(3): 921-32, 1995 Jul 15.
Article in En | MEDLINE | ID: mdl-11539396
ABSTRACT
Several commonly used approximate methods for the calculation of vibration--rotation--tunneling spectra for (HCl)2 are described. These range from one-dimensional models to an exact coupled four-dimensional treatment of the intermolecular dynamics. Two different potential surfaces were employed--an ab initio and our ES1 experimental surface (determined by imbedding the four-dimensional calculation outlined here in a least-squares loop to fit the experimental data, which is described in the accompanying paper [J. Chem. Phys. 103, 933 (1995)]. The most important conclusion deduced from this work is that the validity of the various approximate models is extremely system specific. All of the approximate methods addressed in this paper were found to be sensitive to the approximate separability of the radial and angular degrees of freedom, wherein exists the primary difference between the two potentials. Of particular importance, the commonly used reversed adiabatic angular approximation was found to be very sensitive to the choice for fixed R; an improper choice would lead to results very much different from the fully coupled results and perhaps to false conclusions concerning the intermolecular potential energy surface.
Subject(s)
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Collection: 01-internacional Database: MEDLINE Main subject: Models, Molecular / Chemistry, Physical / Hydrochloric Acid Language: En Journal: J Chem Phys Year: 1995 Document type: Article Affiliation country: United States
Search on Google
Collection: 01-internacional Database: MEDLINE Main subject: Models, Molecular / Chemistry, Physical / Hydrochloric Acid Language: En Journal: J Chem Phys Year: 1995 Document type: Article Affiliation country: United States