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Cahn–Hilliard theory with triple-parabolic free energy. II. Nucleation and growth in the presence of a metastable crystalline phase
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Theoretical analysis of alkali metal trapping sites in rare gas matrices

J. Chem. Phys. 112, 2420 (2000); doi:10.1063/1.480825

Issue Date: 1 February 2000

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Jussi Ahokas, Toni Kiljunen, Jussi Eloranta, and Henrik Kunttu
Department of Chemistry, University of Jyväskylä, P.O.Box 35, FIN-40351 Jyväskylä, Finland
The rare gas (Ne, Ar, Kr, Xe)–alkali metal (Li, Na) ground-state pair interaction potentials and distance-dependent isotropic hyperfine coupling constants are evaluated by coupled-cluster approaches at the van der Waals region of the dimers. The computed properties are further utilized in classical molecular dynamics simulations of rare gas lattices doped with alkali atoms. Atomic trajectories and time averaged hyperfine constants are obtained from the simulations and exploited to provide theoretical insights into experimentally observed atomic trapping and dynamics of alkali metal atoms in rare gas matrices. The simulations support our previous electron paramagnetic resonance (EPR) data [Chem. Phys. Lett, 310, 245 (1999)], suggesting that alkali metal atoms, while generated by laser vaporization, do trap in single substitutional sites, whereas thermal atom sources yield trapping in multiple substitutional sites. In order to theoretically reproduce the EPR spectra for the latter case, more than six neighboring vacancies had to be included in the model system. Based on the simulations, the trapped atoms are able to move rather freely within the extended cage. ©2000 American Institute of Physics.
History: Received 13 July 1999; accepted 9 November 1999
Permalink: http://link.aip.org/link/?JCPSA6/112/2420/1
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KEYWORDS and PACS

Keywords
PACS
  • 34.20.Cf
    Atomic and molecular collision processes and interactions Interatomic and intermolecular potentials and forces, potential energy surfaces for collisions Interatomic potentials and forces
  • 31.15.Dv
    Electronic structure of atoms, molecules and their ions: theory Calculations and mathematical techniques in atomic and molecular physics (excluding electron correlation calculations) Coupled cluster theory
  • 31.15.Qg
    Electronic structure of atoms, molecules and their ions: theory Calculations and mathematical techniques in atomic and molecular physics (excluding electron correlation calculations) Molecular dynamics and other numerical methods
  • 31.30.Gs
    Electronic structure of atoms, molecules and their ions: theory Corrections to electronic structure Hyperfine interactions and isotope effects, Jahn-Teller effect
  • YEAR: 2000

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ISSN:
0021-9606 (print)   1089-7690 (online)
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