### Abstract

A general formalism is used to express the long-range potential energies in inverse powers of the separation distance between two like atomic or molecular systems with P symmetries. The long-range molecular interaction coefficients are calculated for the molecular symmetries ?, ?, and ?, arising from the following interactions: He (2 P1) -He (2 P1), He (2 P1) -He (2 P3), and He (2 P3) -He (2 P3). The electric quadrupole-quadrupole term C5, the van der Waals (dispersion) term C6, and higher-order terms C8 and C10 are calculated ab initio using accurate variational wave functions in Hylleraas coordinates with finite nuclear mass effects. A comparison is made with previously published results where available. � 2007 The American Physical Society.

Original language | English |
---|---|

Pages (from-to) | 12723-12731 |

Number of pages | 9 |

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

Volume | 76 |

Issue number | 1 |

Publication status | Published - 2007 |

## Fingerprint Dive into the research topics of 'Accurate long-range coefficients for two excited like isotope He atoms: He (2 P1) -He (2 P1), He (2 P1) -He (2 P3), and He (2 P3) -He (2 P3)'. Together they form a unique fingerprint.

## Cite this

Zhang, J-Y., YAN, Z., Vrinceanu, D., BABB, J., & Sadeghpour, H. (2007). Accurate long-range coefficients for two excited like isotope He atoms: He (2 P1) -He (2 P1), He (2 P1) -He (2 P3), and He (2 P3) -He (2 P3).

*Physical Review A - Atomic, Molecular, and Optical Physics*,*76*(1), 12723-12731.