Third-order perturbation theory for van der Waals interaction coefficients

Li-Yan Tang, Zong-Chao Yan, Ting-Yun Shi, James Mitroy

    Research output: Contribution to journalArticlepeer-review


    The third-order expression for the dispersion interaction between two atoms is written as a sum over lists of transition matrix elements. Particular attention is given to the C9/R9 interaction which occurs in the homonuclear case when one atom is in an S state and the other is in a P state. Numerical values of the C9 coefficient are given for the homonuclear alkali-metal dimers. The size of the C9:C3 dispersion coefficient ratio increases for the heavier alkali-metal atoms. The C11 and C13 coefficients between two helium atoms and lithium atoms in their ground states are also given.
    Original languageEnglish
    Article number052502
    Pages (from-to)1-9
    Number of pages9
    JournalPhysical Review A - Atomic, Molecular, and Optical Physics
    Issue number5
    Publication statusPublished - 4 Nov 2011


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