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Core-valence correlating basis sets for alkali and alkaline earth metal atoms

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Abstract

For 12 alkali and alkaline earth metal atoms from Li to Ra, contracted Gaussian-type function sets are developed for the description of correlations among the (n−1)s, (n−1)p, and ns electrons, where n is the principal quantum number of the outermost shell. A segmented contraction scheme is employed for the compactness and efficiency. Contraction coefficients and exponents are determined so that the deviation from accurate natural orbitals of the ground states is minimized. For heavy atoms from Cs to Ra, the spin-free relativistic effects are considered through the third-order Douglas–Kroll approximation. To test the present correlating sets, all-electron calculations are performed for the ground state of 12 diatomic hydrides, 6 alkali metal dimers, 4 alkaline earth metal oxides, and 12 diatomic fluorides. The calculated spectroscopic constants are in excellent agreement with the experimental values.

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Acknowledgments

The authors would like to acknowledge Prof. Miyoshi and Dr. Nakayama for helpful discussion. This work was supported in part by a Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science, and Technology of Japan.

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Authors and Affiliations

  1. Division of Chemistry, Graduate School of Science, Hokkaido University, Sapporo, Hokkaido, 060-0810, Japan

    Takeshi Noro

  2. Department of Intercultural Studies, Tomakomai Komazawa University, Tomakomai, Hokkaido, 059-1292, Japan

    Masahiro Sekiya

  3. Department of Applied Chemistry, Muroran Institute of Technology, Muroran, Hokkaido, 050-8585, Japan

    Toshikatsu Koga

Authors
  1. Takeshi Noro
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  2. Masahiro Sekiya
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  3. Toshikatsu Koga
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Correspondence to Takeshi Noro.

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Noro, T., Sekiya, M. & Koga, T. Core-valence correlating basis sets for alkali and alkaline earth metal atoms. Theor Chem Account 121, 289–295 (2008). https://doi.org/10.1007/s00214-008-0476-x

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  • DOI: https://doi.org/10.1007/s00214-008-0476-x

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