Ab Initio Values of the Thermophysical Properties of Helium as Standards
Recent quantum mechanical calculations of the interaction energy of pairs of helium atoms are accurate and some include reliable estimates of their uncertainty. We combined these ab initio results with earlier published results to obtain a helium-helium interatomic potential that includes relativist...
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[Gaithersburg, MD] : U.S. Dept. of Commerce, National Institute of Standards and Technology
2000
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| Online Access: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4872693/ |
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pubmed-48726932016-08-22 Ab Initio Values of the Thermophysical Properties of Helium as Standards Hurly, John J. Moldover, Michael R. Article Recent quantum mechanical calculations of the interaction energy of pairs of helium atoms are accurate and some include reliable estimates of their uncertainty. We combined these ab initio results with earlier published results to obtain a helium-helium interatomic potential that includes relativistic retardation effects over all ranges of interaction. From this potential, we calculated the thermophysical properties of helium, i.e., the second virial coefficients, the dilute-gas viscosities, and the dilute-gas thermal conductivities of 3He, 4He, and their equimolar mixture from 1 K to 104 K. We also calculated the diffusion and thermal diffusion coefficients of mixtures of 3He and 4He. For the pure fluids, the uncertainties of the calculated values are dominated by the uncertainties of the potential; for the mixtures, the uncertainties of the transport properties also include contributions from approximations in the transport theory. In all cases, the uncertainties are smaller than the corresponding experimental uncertainties; therefore, we recommend the ab initio results be used as standards for calibrating instruments relying on these thermophysical properties. We present the calculated thermophysical properties in easy-to-use tabular form. [Gaithersburg, MD] : U.S. Dept. of Commerce, National Institute of Standards and Technology 2000 2000-10-01 /pmc/articles/PMC4872693/ /pubmed/27551630 http://dx.doi.org/10.6028/jres.105.054 Text en https://creativecommons.org/publicdomain/zero/1.0/ The Journal of Research of the National Institute of Standards and Technology is a publication of the U.S. Government. The papers are in the public domain and are not subject to copyright in the United States. Articles from J Res may contain photographs or illustrations copyrighted by other commercial organizations or individuals that may not be used without obtaining prior approval from the holder of the copyright. |
| repository_type |
Open Access Journal |
| institution_category |
Foreign Institution |
| institution |
US National Center for Biotechnology Information |
| building |
NCBI PubMed |
| collection |
Online Access |
| language |
English |
| format |
Online |
| author |
Hurly, John J. Moldover, Michael R. |
| spellingShingle |
Hurly, John J. Moldover, Michael R. Ab Initio Values of the Thermophysical Properties of Helium as Standards |
| author_facet |
Hurly, John J. Moldover, Michael R. |
| author_sort |
Hurly, John J. |
| title |
Ab Initio Values of the Thermophysical Properties of Helium as Standards |
| title_short |
Ab Initio Values of the Thermophysical Properties of Helium as Standards |
| title_full |
Ab Initio Values of the Thermophysical Properties of Helium as Standards |
| title_fullStr |
Ab Initio Values of the Thermophysical Properties of Helium as Standards |
| title_full_unstemmed |
Ab Initio Values of the Thermophysical Properties of Helium as Standards |
| title_sort |
ab initio values of the thermophysical properties of helium as standards |
| description |
Recent quantum mechanical calculations of the interaction energy of pairs of helium atoms are accurate and some include reliable estimates of their uncertainty. We combined these ab initio results with earlier published results to obtain a helium-helium interatomic potential that includes relativistic retardation effects over all ranges of interaction. From this potential, we calculated the thermophysical properties of helium, i.e., the second virial coefficients, the dilute-gas viscosities, and the dilute-gas thermal conductivities of 3He, 4He, and their equimolar mixture from 1 K to 104 K. We also calculated the diffusion and thermal diffusion coefficients of mixtures of 3He and 4He. For the pure fluids, the uncertainties of the calculated values are dominated by the uncertainties of the potential; for the mixtures, the uncertainties of the transport properties also include contributions from approximations in the transport theory. In all cases, the uncertainties are smaller than the corresponding experimental uncertainties; therefore, we recommend the ab initio results be used as standards for calibrating instruments relying on these thermophysical properties. We present the calculated thermophysical properties in easy-to-use tabular form. |
| publisher |
[Gaithersburg, MD] : U.S. Dept. of Commerce, National Institute of Standards and Technology |
| publishDate |
2000 |
| url |
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4872693/ |
| _version_ |
1613581441436745728 |