Abstract
The MRDCI procedure and large Gaussian basis sets are employed to calculate the lowest two potential energy curves in each of the 2Σ u,g and 2Π u,g symmetry sectors of He 2 +. Using the obtained adiabatic curves, for both systems 3He 4He + and 4He 2 + vibrational rotational energy levels and various transition frequencies are computed. Comparison of the results and the dissociation energy D e with other recent theoretical and experimental data indicates that the achieved accuracy is of the same order as eventual nonadiabatic corrections.
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