SARPAL, BK; TENNYSON, J; MORGAN, LA; (1991) VIBRATIONALLY RESOLVED ELECTRON HEH+ COLLISIONS USING THE NONADIABATIC R-MATRIX METHOD. **J PHYS B-AT MOL OPT** , 24 (7) 1851 - 1866.

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## Abstract

We use the R-matrix formalism for the electron-molecule collision problem to calculate elastic scattering cross sections for the HeH+ ion as a function of internuclear separation. Vibrationally resolved elastic and inelastic cross sections are obtained within the adiabatic and the non-adiabatic nuclei approximation. These calculations give cross sections of similar magnitude but the non-adiabatic results show complicated series of 'nuclear-excited Feshbach' resonances. The lowest 2-SIGMA resonances coincide with unexplained structures in the observed dissociative recombination cross section. We find that the vibrational excitation cross sections are considerably smaller than those calculated using the Coulomb-Born approximation, offering one explanation for why HeH+ has not so far been detected in planetary nebulae.

Type: | Article |
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Title: | VIBRATIONALLY RESOLVED ELECTRON HEH+ COLLISIONS USING THE NONADIABATIC R-MATRIX METHOD |

Keywords: | QUANTUM-DEFECT THEORY, CONFIGURATION INTERACTION, MOLECULAR ION, STATES, SCATTERING, EQUATIONS, PROGRAM |

UCL classification: | UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Physics and Astronomy |

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