The higher-order C_n dispersion coefficients for hydrogen

Details The higher-order C_n dispersion coefficients for hydrogen The higher-order C_n dispersion coefficients for hydrogen

2004-11-19

arxiv.org/abs/physics/0411172v1

Phys.Rev.A 71 032709 (2005)

Physics

Atomic Physics

5 pages under review PRA

Scientific paper

10.1103/PhysRevA.71.032709

The complete set of 2nd, 3rd and 4th order van der Waals coefficients, C_n 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 C_n (n<=16) coefficients are accurate to 13 significant digits. The relative size of the 4th-order C^4_n to the 2nd-order C^2_n coefficients is seen to increase as n increases and at n=32 the 4th-order term is actually larger.

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