## Abstract

The R-matrix method is used in an ab initio study of low energy elastic scattering by He_{2} ^{+} molecular ions. SCF and correlated CI wavefunctions have been used in a two state approximation, which retains the lowest two states, ^{2}∑_{u} ^{+} and ^{2}∑_{g} ^{+}, of the He_{2} ^{+} molecular ion in the scattering basis. Cross section calculations have been performed at two fixed internuclear separations, 1.8 and 2.0625 a_{0}. At the equilibrium bond separation we have detected and fitted the lowest lying npσ ^{3}Σ_{u} ^{+} resonances in the ^{3}Σ^{+} _{u} scattering symmetry. In addition, bound state calculations have also been carried out for the He_{2} (1σ_{g} ^{+}1σ_{u}2s a^{3}Σ_{u} ^{+}) state at these two internuclear separations and are seen to compare favorably with MCSCF and SOCI results.

Original language | English |
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Pages (from-to) | 518-530 |

Number of pages | 13 |

Journal | Nuclear Inst. and Methods in Physics Research, B |

Volume | 53 |

Issue number | 4 |

DOIs | |

Publication status | Published - 03 Apr 1991 |

## ASJC Scopus subject areas

- Nuclear and High Energy Physics
- Instrumentation