Shaul, K.
, Schultz, A.
, Kofke, D.
and Moldover, M.
(2012),
Semiclassical fifth virial coefficients for improved ab initio helium-­4 standards, Chemical Physics Letters, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=910524
(Accessed October 27, 2025)
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Semiclassical fifth virial coefficients for improved ab initio helium-4 standards
Published
Author(s)
Katherine Shaul, Andrew Schultz, David A. Kofke,
Abstract
For helium-4, we present ab initio, semi-classical calculations of virial coefficients Bn for for n = 2, 3, 4, and 5 from 50 K to 1000 K. Using our values of B4 and B5 and the more accurate literature values of B2 and B3, we argue that the ab initio virial equation of state is more accurate than recent, high-quality, densimeter measurements spanning the range 223 K < T < 500 K, p < 38 MPa}. Thus, the present values of B4 and B5 extend the useful temperature and density range of ab initio helium standards.Citation
Chemical Physics Letters
Volume
531
Pub Type
Journals
Download Paper
Keywords
equation of state, helium, gas standards, virial coefficients, thermodynamic standards
Citation
Issues
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Created February 14, 2012, Updated October 12, 2021