Higher-order Cn dispersion coefficients for the alkali-metal atoms

Mitroy, J. and Bromley, M. W. J. (2005) Higher-order Cn dispersion coefficients for the alkali-metal atoms. Physical Review A, 71 4: . doi:10.1103/PhysRevA.71.042701

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Author Mitroy, J.
Bromley, M. W. J.
Title Higher-order Cn dispersion coefficients for the alkali-metal atoms
Formatted title
Higher-order Cn dispersion coefficients for the alkali-metal atoms
Journal name Physical Review A   Check publisher's open access policy
ISSN 1050-2947
Publication date 2005-04
Sub-type Article (original research)
DOI 10.1103/PhysRevA.71.042701
Open Access Status File (Publisher version)
Volume 71
Issue 4
Total pages 7
Place of publication College Park, MD, United States
Publisher American Physical Society
Language eng
Formatted abstract
The van der Waals coefficients, from C11 through to C16 resulting from second-, third-, and fourth-order perturbation theory are estimated for the alkali-metal sLi, Na, K, and Rbd atoms. The dispersion coefficients are also computed for all possible combinations of the alkali-metal atoms and hydrogen. The parameters are determined from sum rules after diagonalizing a semiempirical fixed core Hamiltonian in a large basis. Comparisons of the radial dependence of the Cn / rn potentials give guidance as to the radial regions in which the various higher-order terms can be neglected. It is seen that including terms up to C10/ r10 results in a dispersion interaction that is accurate to better than 1% whenever the inter-nuclear spacing is larger than 20a0. This level of accuracy is mainly achieved due to the fortuitous cancellation between the repulsive (C11,C13,C15) and attractive (C12,C14,C16) dispersion forces.
Keyword Long-range interaction
Scattering lengths
Hydrogen atoms
Sum rules
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
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