### Abstract

An finite-nuclear-mass (FNM) approach is employed to describe the magnetic orbit-orbit interaction of the electrons and the nucleus orbiting around the center of mass of the helium atom in ^{1}S and ^{1}P Rydberg states. The calculations are performed using explicitly correlated Gaussian functions to expand the states’ wave functions. The non-linear parameters of the Gaussians are optimized using a variational approach employing the analytical energy gradient. An FNM and INM (infinite-nuclear-mass) approaches are used in the optimization and compared.

Original language | English (US) |
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Pages (from-to) | 66-70 |

Number of pages | 5 |

Journal | Chemical Physics Letters |

Volume | 712 |

DOIs | |

State | Published - Nov 16 2018 |

### ASJC Scopus subject areas

- Physics and Astronomy(all)
- Physical and Theoretical Chemistry

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## Cite this

Stanke, M., & Adamowicz, L. (2018). Magnetic orbit-orbit interaction involving electrons and the nucleus orbiting around the center of mass in

^{1}S and^{1}P Rydberg states of helium. Finite-nuclear-mass calculations with explicitly correlated Gaussian functions.*Chemical Physics Letters*,*712*, 66-70. https://doi.org/10.1016/j.cplett.2018.09.060