The ab initio limit quartic force field of BH3
(c) 2005 Wiley Periodicals, Inc.
| Veröffentlicht in: | Journal of computational chemistry. - 1984. - 26(2005), 11 vom: 15. Aug., Seite 1106-12 |
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| Weitere Verfasser: | , |
| Format: | Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2005
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| Zugriff auf das übergeordnete Werk: | Journal of computational chemistry |
| Schlagworte: | Journal Article |
| Zusammenfassung: | (c) 2005 Wiley Periodicals, Inc. The complete quartic force field of BH(3) has been converged to the ab initio limit by extrapolation of core-valence correlation-consistent basis set series (cc-pCVXZ, X = T, Q, 5) of all-electron CCSD(T) (coupled-cluster singles and doubles with perturbative triples) energy points. Additional computations including full coupled-cluster treatments through quadruple excitations (CCSDTQ), scalar relativistic effects, and diagonal Born-Oppenheimer corrections (DBOC) were concurrently executed. Within second-order vibrational perturbation theory (VPT2) our quartic force field yields the fundamental frequencies nu(1) = 2502.3 cm(-1), nu(2) = 1147.2 cm(-1), nu(3) = 2602.1 cm(-1), and nu(4) = 1196.5 cm(-1), in excellent agreement with observed gas-phase fundamentals, displaying a mean absolute error of only 0.3 cm(-1). Our converged prediction for the equilibrium bond length of BH(3) is r(e) = 1.1867 A |
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| Beschreibung: | Date Completed 28.07.2005 Date Revised 20.06.2005 published: Print Citation Status PubMed-not-MEDLINE |
| ISSN: | 1096-987X |