van der Waals revisited |
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| Authors: | Klaus Bä rwinkel,Jü rgen Schnack |
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| Affiliation: | a Universität Osnabrück, Fachbereich Physik, D-49069 Osnabrück, Germany
b Universität Bielefeld, Fakultät für Physik, Postfach 100131, D-33501 Bielefeld, Germany |
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| Abstract: | The van-der-Waals version of the second virial coefficient is not far from being exact if the model parameters are appropriately chosen. It is shown how the van-der-Waals resemblance originates from the interplay of thermal averaging and superposition of scattering phase shift contributions. The derivation of the two parameters from the quantum virial coefficient reveals a fermion-boson symmetry in non-ideal quantum gases. Numerical details are worked out for the Helium quantum gases. |
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| Keywords: | 05.20.Dd 05.30.-d 05.30.Ch 31.15.Lc 51.10.+y |
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