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Precise calculations of the effective-range expansion parameters for the Lennard-Jones potential

1984; American Institute of Physics; Volume: 30; Issue: 2 Linguagem: Inglês

10.1103/physreva.30.941

0556-2791

E. Buendı́a, R. Guardiola, M. de Llano,

Atomic and Molecular Physics

Several effective-range-theory parameters for the Lennard-Jones 12-6 potential needed in helium equation-of-state calculations are determined analytically. Though the results are not expressed in terms of known functions, we show how they may be computed at machine precision. The power expansion of these parameters in terms of the coupling constant of the attractive part of the potential is also determined through the first fourteen terms.