Higher-order C n dispersion coefficients for hydrogen

James Mitroy, Michael Bromley

    Research output: Contribution to journalArticle

    Abstract

    The complete set of second-, third-, and fourth-order van der Waals coefficients C n up to n=32 for the H(1s)-H(1s) dimer have been determined. They are computed by diagonalizing the nonrelativistic Hamiltonian for hydrogen to obtain a set of pseudostates that are used to evaluate the appropriate sum rules. A study of the convergence pattern for n?16 indicates that all the C n?16 coefficients are accurate to 13 significant digits. The relative size of the fourth-order C n (4) to the second-order C n (2) coefficients is seen to increase as n increases and at n=32 the fourth-order term is actually larger. �2005 The American Physical Society.
    Original languageEnglish
    Pages (from-to)32709-32713
    Number of pages5
    JournalPhysical Review A - Atomic, Molecular, and Optical Physics
    Volume71
    Issue number3
    Publication statusPublished - 2005

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