Autoionising states of He22+: adiabatic potential energy curves

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Abstract
The adiabatic potential energy curves of the He22+ system are obtained by the configuration-interaction method using 33 terms of one-centre Slater-type orbitals as basis functions. The calculation is carried out in the range of internuclear distance. The calculation is carried out in the range of internuclear distance R from 0.0 to 0.5 atomic units. The results include the potential curves of the autoionising states, 1 Sigma g(2s sigma 2,2p sigma 2,2p pi 2), 1 Pi g(2p sigma 2p pi ) and 1 Delta g(2p pi 2). Both computations with and without the 1s sigma nl lambda configurations are performed and the results are compared. The potential curves of states 1 Sigma g(2s sigma 2) and 1 Sigma g(2p sigma 2) have a pseudo-crossing at R approximately=0.2 au.

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