Calculations of long-range three-body interactions for Li(2S2)Li(2S2)Li(2P2)

Pei-Gen Yan, Li-Yan Tang, Zong-Chao Yan, and James F. Babb
Phys. Rev. A 94, 022705 – Published 9 August 2016

Abstract

General formulas for calculating the several leading long-range interactions among three identical atoms where two atoms are in identical S states and the other atom is in a P state are obtained using perturbation theory for the energies up to second order. The first-order (dipolar) interactions depend on the geometrical configurations of the three atoms. In second order, additive and nonadditive dispersion interactions are obtained. The nonadditive interactions depend on the geometrical configurations in marked contrast to the case where all three atoms are in identical S states, for which the nonadditive (also known as triple-dipole or as Axilrod-Muto-Teller) dispersion interactions appear at the third order. The formalism is demonstrated by the calculation of the coefficients for the Li(2S2)Li(2S2)Li(2P2) system using variationally generated atomic lithium wave functions in Hylleraas coordinates. The present dipolar coefficients and additive and nonadditive dispersion coefficients may be useful in constructing precise potential energy surfaces for this three lithium atom system.

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  • Received 17 February 2016
  • Revised 4 July 2016

DOI:https://doi.org/10.1103/PhysRevA.94.022705

©2016 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

Pei-Gen Yan1,2, Li-Yan Tang2,*, Zong-Chao Yan1,2,3, and James F. Babb4

  • 1Department of Physics, University of New Brunswick, Fredericton, New Brunswick, E3B 5A3, Canada
  • 2State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, People's Republic of China
  • 3Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071, People's Republic of China
  • 4ITAMP, Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts 02138, USA

  • *Corresponding author: lytang@wipm.ac.cn

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Issue

Vol. 94, Iss. 2 — August 2016

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