Recent experimental evidence that the rotationless X 2Σ+ state potential of BeH possesses a small maximum is examined and is shown to be somewhat equivocal. Complete configuration interaction calculations involving the three valence electrons are carried out for the two lowest states of 2Σ+ symmetry. The X 2Σ+ state potential shows no potential maximum and spectroscopic constants for the C 2Σ+ agree very well with experiment.
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David L. Cooper (1984) studied this question.
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