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

Mitroy, Jim and Bromley, Michael W. J. (2005). Higher-order Cn dispersion coefficients for the alkali-metal atoms. Physical Review A (Atomic, Molecular and Optical Physics),71(4):042701-1-042701-7.

Document type: Journal Article
Citation counts: Scopus Citation Count Cited 12 times in Scopus Article | Citations

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IRMA ID 80791673xPUB89
Title Higher-order Cn dispersion coefficients for the alkali-metal atoms
Author Mitroy, Jim
Bromley, Michael W. J.
Journal Name Physical Review A (Atomic, Molecular and Optical Physics)
Publication Date 2005
Volume Number 71
Issue Number 4
ISSN 1094-1622   (check CDU catalogue open catalogue search in new window)
Scopus ID 2-s2.0-26944462034
Start Page 042701-1
End Page 042701-7
Total Pages 7
Place of Publication College Park, United States
Publisher American Physical Society
Field of Research 0202 - Atomic, Molecular, Nuclear, Particle and Plasma Physics
0204 - Condensed Matter Physics
0205 - Optical Physics
HERDC Category C1 - Journal Article (DEST)
Abstract The van der Waals coefficients, from C-11 through to C-16 resulting from second-, third-, and fourth-order perturbation theory are estimated for the alkali-metal (Li, Na, K, and Rb) 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 C-n/r(n) 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 C-10/r(10) results in a dispersion interaction that is accurate to better than 1% whenever the inter-nuclear spacing is larger than 20a(0). This level of accuracy is mainly achieved due to the fortuitous cancellation between the repulsive (C-11,C-13,C-15) and attractive (C-12,C-14,C-16) dispersion forces.
Keywords collisions
long-range interaction
scattering lengths
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Additional Notes Copyright by the The American Physical Society

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