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Calculated values of the second dielectric and refractivity virial coefficients of helium, neon, and argon.

Published by National Institute of Standards and Technology | National Institute of Standards and Technology | Catalog Last Checked: August 03, 2026 at 03:50 AM | Dataset Last Updated: April 23, 2020
Values of second dielectric and refractivity virial coefficients computed, with rigorous accounting for quantum effects, from state-of-the-art pair potentials and interaction polarizabilities. Values given at 1 K intervals (finer intervals below 10 K) for helium (both mass 3 and 4 isotopes), neon (both mass 20 and 22 isotopes), and argon (mass 40 isotope). Upper temperature limit is 2000 K in all cases. Lower temperature limit is 0.5 K for helium, 4 K for neon, 50 K for argon. These files are Supplemental information to: G. Garberoglio and A.H. Harvey, "Path-integral Calculation of the Second Dielectric and Refractivity Virial Coefficients of Helium, Neon, and Argon," published in J. Res. NIST , volume 125, article 125022 (2020) [https://doi.org/10.6028/jres.125.022], which describes how the values were calculated.

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Complete Metadata
@type dcat:Dataset
accessLevel public
bureauCode 
[
  "006:55"
]
contactPoint 
{
  "fn": "Allan H. Harvey",
  "hasEmail": "mailto:allan.harvey@nist.gov"
}
description Values of second dielectric and refractivity virial coefficients computed, with rigorous accounting for quantum effects, from state-of-the-art pair potentials and interaction polarizabilities. Values given at 1 K intervals (finer intervals below 10 K) for helium (both mass 3 and 4 isotopes), neon (both mass 20 and 22 isotopes), and argon (mass 40 isotope). Upper temperature limit is 2000 K in all cases. Lower temperature limit is 0.5 K for helium, 4 K for neon, 50 K for argon. These files are Supplemental information to: G. Garberoglio and A.H. Harvey, "Path-integral Calculation of the Second Dielectric and Refractivity Virial Coefficients of Helium, Neon, and Argon," published in J. Res. NIST , volume 125, article 125022 (2020) [https://doi.org/10.6028/jres.125.022], which describes how the values were calculated.
distribution 
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  {
    "title": "DOI Access for Calculated values of the second dielectric and refractivity virial coefficients of helium, neon, and argon.",
    "accessURL": "https://doi.org/10.18434/M32225"
  },
  {
    "title": "Readme.txt",
    "format": "txt file",
    "mediaType": "text/plain",
    "description": "Readme file documenting the various data files",
    "downloadURL": "https://data.nist.gov/od/ds/mds2-2225/Readme.txt"
  },
  {
    "title": "Classical B_eps for argon",
    "format": "ASCII .dat file",
    "mediaType": "application/octet-stream",
    "description": "Second dielectric virial coefficient for argon, calculated classically",
    "downloadURL": "https://data.nist.gov/od/ds/mds2-2225/Beps_Ar_classical.dat"
  },
  {
    "title": "Classical B_eps for helium",
    "format": "ASCII .dat file",
    "mediaType": "application/octet-stream",
    "description": "Second dielectric virial coefficient for helium, calculated classically",
    "downloadURL": "https://data.nist.gov/od/ds/mds2-2225/Beps_He_classical.dat"
  },
  {
    "title": "B_eps for helium-3",
    "format": "ASCII .dat file",
    "mediaType": "application/octet-stream",
    "description": "Second dielectric virial coefficient for helium-3, calculated fully quantum, with its expanded uncertainty",
    "downloadURL": "https://data.nist.gov/od/ds/mds2-2225/Beps_He3.dat"
  },
  {
    "title": "B_eps for helium-4",
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    "mediaType": "application/octet-stream",
    "description": "Second dielectric virial coefficient for helium-4, calculated fully quantum, with its expanded uncertainty.",
    "downloadURL": "https://data.nist.gov/od/ds/mds2-2225/Beps_He4.dat"
  },
  {
    "title": "Classical B_eps for neon",
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    "mediaType": "application/octet-stream",
    "description": "Second dielectric virial coefficient for neon, calculated classically",
    "downloadURL": "https://data.nist.gov/od/ds/mds2-2225/Beps_Ne_classical.dat"
  },
  {
    "title": "B_eps for neon-20",
    "format": "ASCII .dat file",
    "mediaType": "application/octet-stream",
    "description": "Second dielectric virial coefficient for neon-20, calculated fully quantum",
    "downloadURL": "https://data.nist.gov/od/ds/mds2-2225/Beps_Ne20.dat"
  },
  {
    "title": "B_eps for neon-22",
    "format": "ASCII .dat file",
    "mediaType": "application/octet-stream",
    "description": "Second dielectric virial coefficient for neon-22, calculated fully quantum",
    "downloadURL": "https://data.nist.gov/od/ds/mds2-2225/Beps_Ne22.dat"
  },
  {
    "title": "B_eps for argon-40",
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    "description": "Second dielectric virial coefficient of argon-40, quantum calculation, with its expanded uncertainty.",
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  {
    "title": "B_R for argon-40",
    "format": "ASCII .dat file",
    "mediaType": "application/octet-stream",
    "description": "Second refractivity virial coefficient and dispersion correction factor for argon-40",
    "downloadURL": "https://data.nist.gov/od/ds/mds2-2225/BR_Ar40.dat"
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  {
    "title": "B_R for helium-3",
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    "description": "Second refractivity virial coefficient and dispersion correction factor for helium-3",
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    "description": "Second refractivity virial coefficient and dispersion correction factor for helium-4",
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  },
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    "title": "B_R for neon-20",
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    "mediaType": "application/octet-stream",
    "description": "Second refractivity virial coefficient and dispersion correction factor for neon-20",
    "downloadURL": "https://data.nist.gov/od/ds/mds2-2225/BR_Ne20.dat"
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    "title": "B_R for neon-22",
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    "mediaType": "application/octet-stream",
    "description": "Second refractivity virial coefficient and dispersion correction factor for neon-22",
    "downloadURL": "https://data.nist.gov/od/ds/mds2-2225/BR_Ne22.dat"
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    "downloadURL": "https://data.nist.gov/od/ds/mds2-2225/BR_Ne22.dat.sha256"
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  {
    "title": "SHA256 File for B_eps for argon-40",
    "mediaType": "text/plain",
    "downloadURL": "https://data.nist.gov/od/ds/mds2-2225/Beps_Ar40.dat.sha256"
  },
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    "mediaType": "text/plain",
    "downloadURL": "https://data.nist.gov/od/ds/mds2-2225/Beps_Ne20.dat.sha256"
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    "downloadURL": "https://data.nist.gov/od/ds/mds2-2225/Beps_Ne22.dat.sha256"
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    "mediaType": "text/plain",
    "downloadURL": "https://data.nist.gov/od/ds/mds2-2225/Beps_Ne_classical.dat.sha256"
  },
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]
identifier ark:/88434/mds2-2225
issued 2020-05-08
keyword 
[
  "argon",
  "dielectric virials",
  "helium",
  "neon",
  "pressure",
  "refractivity virials",
  "thermometry"
]
language 
[
  "en"
]
license https://www.nist.gov/open/license
modified 2020-04-23 00:00:00
programCode 
[
  "006:045"
]
publisher 
{
  "name": "National Institute of Standards and Technology",
  "@type": "org:Organization"
}
theme 
[
  "Chemistry:Theoretical chemistry and modeling",
  "Metrology:Pressure and vacuum metrology",
  "Metrology:Thermometry metrology",
  "Physics:Atomic, molecular, and quantum"
]
title Calculated values of the second dielectric and refractivity virial coefficients of helium, neon, and argon.

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