Publication: An Accurate ab initio potential energy surface and calculated spectroscopic constants for BeH2, BeD2 and BeHD

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Title	An Accurate ab initio potential energy surface and calculated spectroscopic constants for BeH2, BeD2 and BeHD
Authors/Editors*	H. Li, R.J. Le Roy
Where published*	Journal of Chemical Physics
How published*	Journal
Year*	2006
Volume	125
Number
Pages	044307 (9 pp.)
Publisher	American Institute of Physics
Keywords
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Abstract	A three-dimensional potential energy surface for the ground electronic state of BeH2 has been determined by three-dimensional spline interpolation over 6864 symmetry-unique ab initio points calculated at the icMRCI/aug-cc-pV5Z level and corrected for core electron electron correlation computed at the MR-ACPF/cc-pCV5Z level. Calculated spectroscopic constants of BeH2 and BeD2 are in excellent agreement with recent experimental results: for 11 bands of BeH2 and 5 bands of BeD2 the root mean square (RMS) band origin discrepancies were only 0.15(+/-0.09) and 0.46(+-0.19) cm-1, respectively, and the RMS relative discrepancies in the inertial rotational constants (B[v]) were only 0.028% and 0.023%, respectively. Spectral constants for BeHD were predicted using the same potential surface. The effect of different interpolation methods on predicted potential function values and on the calculated level energies and spectroscopic constants has been examined.