On the thermophysical and transport properties of He-3 and He-4: A bubble interaction potential versus state of the art

摘要

Three keynote thermophysical and transport properties of He-3 and He-4, namely, the second virial coefficient, the shear viscosity, and the thermal conductivity, are reported for the "extended Dirac bubble potential" (EDbp), a novel model for He-He [M. Chrysos, J. Chem. Phys. 146, 024106 (2017)]. Comparisons with the experiment as well as with potentials with a proven track record and with the oversimplified Dbp are being made in the range 0.1-500 K to analyze the performance of the EDbp, which is shown here to emerge as a promising analytic model for He-He. A flowchart of how to treat the "buffer" in scattering cross section measurements is designed and conducted, offering a route to EDbp optimization. An impressive consistency with state-of-the-art calculations (which is just striking for such a simple analytic model) is found, essentially thanks to the performance of the phase-shift expression cot delta(l) = lambda kr(0)xi(l)y(l)(kr(0))-y(l)(kr(c))/lambda kr(0)xi(l)j(l)(kr(0))-j(l)(kr(c)), xi(l) = j(l)(kr(0))y(l)(kr(c))-j(l)(kr(c))y(l)(kr(0)). A Multimedia view of delta(l) (k, r(c)) versus k and r(c) is part of the material presented in this article. Data for the "best" r(c)(k) is given as a supplementary material. Published by AIP Publishing.