### Abstract

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 language | English |
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Article number | 052502 |

Pages (from-to) | 1-9 |

Number of pages | 9 |

Journal | Physical Review A - Atomic, Molecular, and Optical Physics |

Volume | 84 |

Issue number | 5 |

DOIs | |

Publication status | Published - 4 Nov 2011 |

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## Cite this

Tang, L-Y., Yan, Z-C., Shi, T-Y., & Mitroy, J. (2011). Third-order perturbation theory for van der Waals interaction coefficients.

*Physical Review A - Atomic, Molecular, and Optical Physics*,*84*(5), 1-9. [052502]. https://doi.org/10.1103/PhysRevA.84.052502