Abstract
The adiabatic potential energy curves of the lowest 1 Sigma g+, 1 Pi g, and 1 Delta g autoionising states for H2 are obtained in the region of internuclear distance 1.0<or=R<or=5.0 au, using Feshbach's projection operator techniques. The energy shift and the energy width of the lowest 1 Sigma g+ autoionising state are calculated for 1.0<or=R<or=2.6 au. It is found that near the stabilisation point (R=2.53 au), the shift is considerable and its effect on the width is not negligible. The revised results for He22+ are also presented.
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