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arXiv · 1006.3818

Ab initio potential curves for the X $^2 \Sigma_{u}^+$ and B $^2 \Sigma_{g}^+$ states of Be$_{2}^+$: Existence of a double minimum

Sandipan Banerjee·Jason N. Byrd·Robin Côté·H. Harvey Michels·John A. Montgomery, Jr
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Abstract

We report ab initio calculations of the X $^2 \Sigma_{u}^+ $ and B $^2 \Sigma_{g}^+$ states of the Be$_{2}^+$ dimer. Full valence configuration interaction calculations were performed using the aug-cc-pVnZ basis sets and the results were extrapolated to the CBS limit. Core-core, core-valence effects are included at the CCSDT/MTsmall level of theory. Two local minima, separated by a large barrier, are found in the expected repulsive B $^2 \Sigma_{g}^+$ state. Spectroscopic constants have been calculated and good agreement is found with the recent measurements of Merritt et al. Bound vibrational levels, transition moments and lifetimes have also been calculated.

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Sandipan Banerjee, Jason N. Byrd, Robin Côté, H. Harvey Michels, John A. Montgomery, Jr. 2010-06-18. Ab initio potential curves for the X $^2 \Sigma_{u}^+$ and B $^2 \Sigma_{g}^+$ states of Be$_{2}^+$: Existence of a double minimum. https://arxiv.org/abs/1006.3818

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