The higher-order Cn dispersion coefficients for hydrogen
Abstract
The complete set of 2nd, 3rd and 4th order van der Waals coefficients, Cn up to n=32 for the H(1s)-H(1s) dimer are computed using pseudo-states to evaluate the appropriate sum rules. A study of the convergence pattern for n<=16 indicates that all the Cn (n<=16) coefficients are accurate to 13 significant digits. The relative size of the 4th-order C4n to the 2nd-order C2n coefficients is seen to increase as n increases and at n=32 the 4th-order term is actually larger.
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