The two-body interaction energies of the cyclic and noncyclic trimers at the basis set limit (15.55 and 16.55 kJ/mol) were estimated by means of second-order Møller–Plesset perturbation theory including terms linear in the interelectronic distance (MP2-R12 approach). Coupled cluster calculations with single and double substitutions and with noniterative triple excitations [CCSD(T)] were carried out to correct the MP2-R12 two-body interaction energies for the effect of higher excitations, and also for the evaluation of the three-body interaction energies. The calculated bonding energies of the trimers using this model calculation (16.82 and 17.20 kJ/mol) suggest that the two isomers are nearly isoenergetic. The three-body terms are small (only of the order of 1 kJ/mol), stabilizing the cyclic trimer, but destabilizing the noncyclic trimer.
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1 September 1999
Research Article|
September 01 1999
High-level ab initio computations of structures and relative energies of two isomers of the trimer
Seiji Tsuzuki;
Seiji Tsuzuki
National Institute of Materials and Chemical Research, Tsukuba, Ibaraki 305-8565, Japan
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Wim Klopper;
Wim Klopper
Theoretical Chemistry Group, Debye Institute, Utrecht University, Padualaan 14, NL-3584 CH Utrecht, The Netherlands
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Hans P. Lüthi
Hans P. Lüthi
Laboratory of Physical Chemistry, ETH Zurich, CH-8092 Zurich, Switzerland
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J. Chem. Phys. 111, 3846–3854 (1999)
Article history
Received:
January 19 1999
Accepted:
June 09 1999
Citation
Seiji Tsuzuki, Wim Klopper, Hans P. Lüthi; High-level ab initio computations of structures and relative energies of two isomers of the trimer. J. Chem. Phys. 1 September 1999; 111 (9): 3846–3854. https://doi.org/10.1063/1.479688
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