R A Buckingham et al 1958 Proc. Phys. Soc. 71 457 doi:10.1088/0370-1328/71/3/319
R A Buckingham1, A R Davies1 and D C Gilles2
Show affiliationsThe Manchester University Mk I computer has been used to calculate accurately the viscosity cross section for hydrogen molecules, and its dependence on the symmetry of the wave function for binary collisions. The calculations assume a central intermolecular potential of (exp, 6, 8) type, and cover reduced temperatures in the range 0.05 ≤ T* ≤ 2.0.
Comparison is made with estimates of the relative difference in viscosity cross sections for para-para and para-ortho collisions derived from Becker and Stehl's measurements. Assuming elastic collisions only, fairly good agreement is found at 15°K, but at higher temperatures the theoretical results become increasingly too small. A central interaction is seemingly inadequate to explain the relatively large ortho-ortho cross sections observed; in this connection the effect of an increased range of interaction is briefly discussed and shown to be unimportant.
51.20.+d Viscosity, diffusion, and thermal conductivity
51.10.+y Kinetic and transport theory of gases
34.20.Gj Intermolecular and atom-molecule potentials and forces
Issue 3 (1 March 1958)
Received 14 October 1957
R A Buckingham et al 1958 Proc. Phys. Soc. 71 457
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