Abstract
We analyse rovibrational transitions of the (2)2Σ+–X(1)2Σ+ system of LiSr and find the energy levels of the (2)2Σ+ state to be perturbed by coupling between the (2)2Σ+ and (1)2Π states. We present an analysis of the coupled system yielding molecular parameters for the lowest vibrational levels of the (2)2Σ+ state and for higher vibrational levels of the (1)2Π state together with molecular coupling constants. Improved Dunham coefficients for the rovibrational levels of the X(1)2Σ+ state are also obtained, where the correlation with the parameters of the excited states is removed completely.
Highlights
In the last decade, much research on the energy structure of molecules consisting of one alkali and one alkaline earth atom has been conducted with the aim to produce ultracold samples of such molecules
We cover a large interval of rotational states and consider a J-dependence of the overlap integrals—or the product of overlap integral and spin-orbit coupling—according to VSfiPt = VScoPnst + VSJP · J (J + 1)
The variation from vibrational pair to vibrational pair reflects the variation of the true overlap integrals
Summary
Much research on the energy structure of molecules consisting of one alkali and one alkaline earth atom has been conducted with the aim to produce ultracold samples of such molecules (see e.g. [1,2,3,4,5]). There exist ab initio calculations [1, 9,10,11,12,13,14] of potential energy curves of several electronic states of LiSr and transition probabilities between its electronic ground state and excited states. These data are very useful guides for spectroscopic studies, which will yield the desired accurate molecular parameters for the experiments with ultracold ensembles. Our extended model gives improved Dunham coefficients for the 2Σ+ states and molecular coupling constants compared to our previous work
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