The A 1Σ+–X 1Σ+ system of the isotopic lithium hydrides: The molecular constants, potential energy curves, and their adiabatic corrections

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Abstract
The molecular constants and their adiabatic corrections have been determined for the A 1Σ+–X 1Σ+ system of the isotopic lithium hydrides: 6LiH, 7LiH, 6LiD, and 7LiD. Using a fully quantum mechanical variational method, the potential energy curves (IPA potentials) are determined. Extending the variational method, we have obtained for the first time adiabatic corrections of potential energy curves from isotopic spectroscopic data. A significant difference between the potential energy curves of the lithium hydrides and the lithium deuterides has been observed. When 6Li was replaced by 7Li, a significant difference was only observed for the A 1Σ+ state, but not for the X 1Σ+ state.