Terms of the quasimolecule HeH₂²⁺ at r = 1.4 au

Figure 4. Terms of the quasimolecule HeH₂²⁺ at r = 1.4 au. Points, the diabatic term determined from experimental data.

Abstract

Energy spectra of electrons ejected into ³He²⁺–H₂ collisions have been measured in the incident ion energy range 6–30 keV. Parameters of the quasimolecule formed during the collision are determined. The dominant role of the channel (2a')² → 1a'3a' → 1a' + e in the production of electrons at keV ion energies has been revealed. The structure associated with autoionization transitions in the projectile helium atoms shows enormously large broadening and shift to lower energies.