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Details for article 18 of 21 found articles
| Title: |
The long-range interaction between He and H+2 an ab initio and dynamical study |
| Author: |
FALCETTA, M.F. SISKA, P.E. |
| Appeared in: |
Molecular physics |
| Paging: | Volume 88 (1996) nr. 3 pages 647-662 |
| Year: |
1996-06-20 |
| Contents: |
A multi-configuration self-consistent field, multi-reference configuration interaction (MCSCF-MRCI) calculation with extended atomic basis sets has been carried out on the electronic ground state of HeH+2 for intermediate-to-large intermolecular distances R between He and H+2 for both C∞v and C2v geometries at a fixed H+2 bond length of 2·0 a0. All energies were corrected for basis set superposition error using the counterpoise method. The most stable geometry occurs in C∞v with a well depth of 7·16 kcal mol-1 (2504 cm-1) at an intermolecular distance of 2·98 a0 (1·576 Å), in good agreement with three previous high level calculations. The anisotropy of the interaction is strong, and is accounted for largely by the induced-dipole-quadrupole long-range force. The computed energy points were fitted to an analytical two-term Legendre expansion incorporating the appropriate long-range behaviour. This potential function was used to compute bound-state rovibrational energy levels of the HeH+2 complex variationally using a basis set method. The intermolecular zero-point energy of the complex was found to be 1020 cm-1, yielding a dissociation energy of 1484 cm-1 (4·24 kcal mol-1). The influence of the anisotropy on complex formation and ion-molecule reactions at thermal energies was assessed using close-coupling optical potential calculations of capture cross-sections; significant positive deviations from Langevin behaviour were found at sub-eV energies. The surface should be of value in interpreting the thermal energy Penning ionization of H2 by excited He. |
| Publisher: |
Taylor & Francis |
| Source file: |
Elektronische Wetenschappelijke Tijdschriften |
Details for article 18 of 21 found articles
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