{"id":4146,"date":"2021-06-08T10:09:04","date_gmt":"2021-06-08T08:09:04","guid":{"rendered":"https:\/\/www.hsu-hh.de\/thermodynamik\/?page_id=4146"},"modified":"2026-03-26T12:38:24","modified_gmt":"2026-03-26T11:38:24","slug":"dr-r-hellmann","status":"publish","type":"page","link":"https:\/\/www.hsu-hh.de\/thermodynamik\/en\/dr-r-hellmann","title":{"rendered":"Peer-reviewed journal articles"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">(last updated 03\/2026)<\/h2>\n\n\n\n<h2 class=\"wp-block-heading\">2026<\/h2>\n\n\n\n<p><strong>Third and fourth density and acoustic virial coefficients of neon from first-principles calculations<\/strong><br><strong>Authors: R. Hellmann, G. Garberoglio<\/strong><br><a href=\"https:\/\/doi.org\/10.1063\/5.0324867\" rel='nofollow'>J. Chem. Phys. 164, 124302 (2026)<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2025<\/h2>\n\n\n\n<p><strong>Cross Second Virial Coefficients of the N<sub>2<\/sub>\u2013H<sub>2<\/sub>, O<sub>2<\/sub>\u2013H<sub>2<\/sub>, and CO<sub>2<\/sub>\u2013H<sub>2<\/sub> Systems from First Principles<\/strong><br><strong>Authors: R. Hellmann, E. Bich<\/strong><br><a href=\"https:\/\/link.springer.com\/article\/10.1007\/s10765-025-03524-6\" rel='nofollow'>Int. J. Thermophys. 46, 67 (2025) (Open Access)<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2024<\/h2>\n\n\n\n<p><strong>Speed of sound measurements and derived third and fourth acoustic virial coefficients of supercritical neon<br>Authors: T. Dietl, A. El Hawary, R. M. Gavioso, R. Hellmann, K. Meier<\/strong><br><a href=\"https:\/\/iopscience.iop.org\/article\/10.1088\/1681-7575\/ad58e6\" rel='nofollow'>Metrologia 61, 045007 (2024)<\/a>.<\/p>\n\n\n\n<p><strong>Cross Second and Third Virial Coefficients and Dilute Gas Transport Properties of the (H<sub>2<\/sub>O + Ar) System from First-Principles Calculations<\/strong><br><strong>Author: R. Hellmann<\/strong><br><a href=\"https:\/\/doi.org\/10.1021\/acs.jced.3c00677\" rel='nofollow'>J. Chem. Eng. Data 69, 942-957 (2024)<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2023<\/h2>\n\n\n\n<p><strong>Cross Second Virial Coefficients of the H<sub>2<\/sub>O\u2013H<sub>2<\/sub>&nbsp;and H<sub>2<\/sub>S\u2013H<sub>2<\/sub>&nbsp;Systems from First-Principles<br>Author: R. Hellmann<\/strong><br><a href=\"https:\/\/doi.org\/10.1021\/acs.jced.3c00300\" rel='nofollow'><\/a><a href=\"https:\/\/doi.org\/10.1021\/acs.jced.3c00300\" rel='nofollow'>J. Chem. Eng. Data&nbsp;68, 2212\u20132222 (2023) (Open Access)<\/a>.<\/p>\n\n\n\n<p><strong><em>Ab initio<\/em>&nbsp;potential energy surfaces for the O<sub>2<\/sub>\u2013O<sub>2<\/sub>&nbsp;system and derived thermophysical properties<br>Author: R. Hellmann<\/strong><br><a href=\"https:\/\/doi.org\/10.1063\/5.0166781\" rel='nofollow'>J. Chem. Phys.&nbsp;159, 104303 (2023) (Open Access).<\/a><\/p>\n\n\n\n<p><strong><em>Ab Initio<\/em>&nbsp;Calculation of Fluid Properties for Precision Metrology<br>Authors: G. Garberoglio, C. Gaiser, R. M. Gavioso, A. H. Harvey, R. Hellmann, B. Jeziorski, K. Meier, <\/strong><br><strong>M. R. Moldover, L. Pitre, K. Szalewicz,<\/strong> <strong>R. Underwood<\/strong><br><a href=\"https:\/\/doi.org\/10.1063\/5.0156293\" rel='nofollow'>J. Phys. Chem. Ref. Data&nbsp;52, 031502 (2023) (Open Access).<\/a><\/p>\n\n\n\n<p><strong>Determination of the Binary Diffusion Coefficients and Interaction Viscosities of the Systems Carbon Dioxide\u2013Nitrogen and Ethane\u2013Methane in the Dilute Gas Phase from Accurate Experimental Viscosity Data Using the Kinetic Theory of Gases<br>Authors: E. Vogel, E. Bich, R. Hellmann<\/strong><br><a href=\"https:\/\/link.springer.com\/article\/10.1007\/s10765-023-03233-y\" rel='nofollow'>Int. J. Thermophys. 44, 129 (2023).<\/a><\/p>\n\n\n\n<p><strong>Cross second virial coefficients of the H<sub>2<\/sub>O\u2013H<sub>2<\/sub>S and H<sub>2<\/sub>O\u2013SO<sub>2<\/sub>&nbsp;systems from first principles<br>Author: R. Hellmann<\/strong><br><a href=\"https:\/\/pubs.acs.org\/doi\/10.1021\/acs.jced.2c00669\" rel='nofollow'>J. Chem. Eng. Data 68, 108-117 (2023).<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2022<\/h2>\n\n\n\n<p><strong>Thermodynamic properties of krypton from Monte Carlo simulations using <em>ab initio<\/em> potentials<br>Authors: P. Str\u00f6ker, R. Hellmann, K. Meier<\/strong><br><a href=\"https:\/\/doi.org\/10.1063\/5.0107851\" rel='nofollow'>J. Chem. Phys. 157, 114504 (2022)<\/a><\/p>\n\n\n\n<p><strong>Thermodynamic properties of argon from Monte Carlo simulations using&nbsp;<em>ab initio<\/em>&nbsp;potentials<br>Authors: P. Str\u00f6ker, R. Hellmann, K. Meier<\/strong><br><a href=\"https:\/\/journals.aps.org\/pre\/abstract\/10.1103\/PhysRevE.105.064129\" rel='nofollow'>Phys. Rev. E 105, 064129 (2022).<\/a><\/p>\n\n\n\n<p><strong>Eighth-Order Virial Equation of State for Methane from Accurate Two-Body and Nonadditive Three-Body Intermolecular Potentials<\/strong><br><strong>Author: R. Hellmann<br><\/strong><a href=\"https:\/\/doi.org\/10.1021\/acs.jpcb.2c01830\" rel='nofollow'>J. Phys. Chem. B 126, 3920-3930 (2022).<\/a><\/p>\n\n\n\n<p><strong>New International Formulation for the Thermal Conductivity of Heavy Water<br>Authors: M. L. Huber, R. A. Perkins, M. J. Assael, S. A. Monogenidou, R. Hellmann, J. V. Sengers<\/strong><br><a href=\"https:\/\/doi.org\/10.1063\/5.0084222\" rel='nofollow'>J. Phys. Chem. Ref. Data 51, 013102 (2022).<\/a> <\/p>\n\n\n\n<p><strong><em>Ab initio<\/em> determination of the polarizability of neon<br>Author: R. Hellmann<\/strong><br><a href=\"https:\/\/doi.org\/10.1103\/PhysRevA.105.022809\" rel='nofollow'>Phys. Rev. A 105, 022809 (2022)<\/a>. <\/p>\n\n\n\n<p><strong>Cross Second Virial Coefficient of the  <strong>H<sub>2<\/sub>O\u2013<\/strong>CO System from a New <em>Ab Initio<\/em> Pair Potential<br>Author: R. Hellmann<\/strong><br><a href=\"https:\/\/doi.org\/10.1007\/s10765-021-02948-0\" rel='nofollow'>Int. J. Thermophys. 43, 25 (2022) (Open Access)<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2021<\/h2>\n\n\n\n<p><strong>Calculation of third to eighth virial coefficients of hard lenses and hard, oblate ellipsoids of revolution employing an efficient algorithm<br>Authors: P. Marienhagen, R. Hellmann, J. Wagner<\/strong><br><a href=\"https:\/\/doi.org\/10.1103\/PhysRevE.104.015308\" rel='nofollow'>Phys. Rev. E 104, 015308 (2021)<\/a>.<\/p>\n\n\n\n<p><strong>Thermophysical properties of low-density neon gas from highly accurate first-principles calculations and dielectric-constant gas thermometry measurements<\/strong><br><strong>Authors:&nbsp;R. Hellmann, C. Gaiser, B. Fellmuth, T. Vasyltsova, E. Bich<\/strong><br><a href=\"https:\/\/doi.org\/10.1063\/5.0047999\" rel='nofollow'>J. Chem. Phys.&nbsp;154,&nbsp;164304 (2021).<\/a><\/p>\n\n\n\n<p><strong>First\u2010Principles Diffusivity Ratios for Atmospheric Isotope Fractionation on Mars and Titan<\/strong><br><strong>Authors: R. Hellmann, A. H. Harvey<\/strong><br><a href=\"https:\/\/doi.org\/10.1029\/2021JE006857\" rel='nofollow'>J. Geophys. Res. Planets 126, e2021JE006857 (2021) (Open Access).<\/a><\/p>\n\n\n\n<p><strong>Systematic formulation of thermodynamic properties in the <em>NpT<\/em> ensemble<\/strong><br><strong>Authors: P. Str\u00f6ker, R. Hellmann, K. Meier<\/strong><br><a href=\"https:\/\/journals.aps.org\/pre\/abstract\/10.1103\/PhysRevE.103.023305\" rel='nofollow'>Phys. Rev. E 103, 023305 (2021).<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2020<\/h2>\n\n\n\n<p><strong>First\u2010Principles Diffusivity Ratios for Kinetic Isotope Fractionation of Water in Air<\/strong><br><strong>Authors: R. Hellmann, A. H. Harvey<\/strong><br><a href=\"https:\/\/doi.org\/10.1029\/2020GL089999\" rel='nofollow'>Geophys. Res. Lett. 47, e2020GL089999 (2020) (Open Access).<\/a><\/p>\n\n\n\n<p><strong>Cross Second Virial Coefficients and Dilute Gas Transport Properties of the Systems (N<sub>2<\/sub>+ C<sub>3<\/sub>H<sub>8<\/sub>), (C<sub>2<\/sub>H<sub>6<\/sub><\/strong><strong> + C<sub>3<\/sub>H<sub>8<\/sub>), and (H<sub>2<\/sub>S + C<sub>3<\/sub>H<sub>8<\/sub>) from Ab Initio-Based Intermolecular Potentials<\/strong><br><strong>Author: R. Hellmann<\/strong><br><a href=\"https:\/\/doi.org\/10.1021\/acs.jced.0c00605\" rel='nofollow'>J. Chem. Eng. Data 65, 4712\u20134724 (2020).<\/a><\/p>\n\n\n\n<p><strong>Reference Values for the Cross Second Virial Coefficients and Dilute Gas Binary Diffusion Coefficients of the Systems (H<sub>2<\/sub>O + O<sub>2<\/sub>) and (H<sub>2<\/sub>O + Air) from First Principles<\/strong><br><strong>Author: R. Hellmann<\/strong><br><a href=\"https:\/\/doi.org\/10.1021\/acs.jced.0c00465\" rel='nofollow'>J. Chem. Eng. Data 65, 4130\u20134141 (2020).<\/a><\/p>\n\n\n\n<p><strong>Zero-density limit of the residual entropy scaling of transport properties<\/strong><br><strong>Authors: I. H. Bell, R. Hellmann, A. H. Harvey<\/strong><br><a href=\"https:\/\/pubs.acs.org\/doi\/10.1021\/acs.jced.9b00455\" rel='nofollow'>J. Chem. Eng. Data 65, 1038\u20131050 (2020).<\/a><\/p>\n\n\n\n<p><strong>Cross second virial coefficients and dilute gas transport properties of the systems (CO<sub>2<\/sub> + C<sub>2<\/sub>H<sub>6<\/sub>) and (H<sub>2<\/sub>S + C<sub>2<\/sub>H<sub>6<\/sub>) from accurate intermolecular potential energy surfaces<\/strong><br><strong>Author: R. Hellmann<\/strong><br><a href=\"https:\/\/pubs.acs.org\/doi\/10.1021\/acs.jced.9b00212\" rel='nofollow'>J. Chem. Eng. Data 65, 968\u2013979 (2020).<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2019<\/h2>\n\n\n\n<p><strong>First-Principles Calculation of the Cross Second Virial Coefficient and the Dilute Gas Shear Viscosity, Thermal Conductivity, and Binary Diffusion Coefficient of the (H<sub>2<\/sub>O + N<sub>2<\/sub>) System<\/strong><br><strong>Author: R. Hellmann<\/strong><br><a href=\"https:\/\/doi.org\/10.1021\/acs.jced.9b00822\" rel='nofollow'>J. Chem. Eng. Data 64, 5959\u20135973 (2019); correction: 65, 2251\u20132252 (2020).<\/a><\/p>\n\n\n\n<p><strong>Eighth-order virial equation of state and speed-of-sound measurements for krypton<\/strong><br><strong>Authors: A. El Hawary, R. Hellmann, K. Meier, H. Busemann<\/strong><br><a href=\"https:\/\/aip.scitation.org\/doi\/10.1063\/1.5124550\" rel='nofollow'>J. Chem. Phys. 151, 154303 (2019).<\/a><\/p>\n\n\n\n<p><strong>Thermal conductivity via entropy scaling: An approach that captures the effect of intramolecular degrees of freedom<\/strong><br><strong>Authors: M. Hopp, J. Mele, R. Hellmann, J. Gross<\/strong><br><a href=\"https:\/\/pubs.acs.org\/doi\/10.1021\/acs.iecr.9b03998\" rel='nofollow'>Ind. Eng. Chem. Res. 58, 18432\u201318438 (2019).<\/a><\/p>\n\n\n\n<p><strong>Fick diffusion coefficients of binary fluid mixtures consisting of methane, carbon dioxide, and propane via molecular dynamics simulations based on simplified pair-specific <em>ab initio<\/em>-derived force fields<\/strong><br><strong>Authors: U. A. Higgoda, C. J. Kankanamge, R. Hellmann, T. M. Koller, A. P. Fr\u00f6ba<\/strong><br><a href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S0378381219303103?via%3Dihub\" rel='nofollow'>Fluid Phase Equilibria 502, 112257 (2019).<\/a><\/p>\n\n\n\n<p><strong>Enhancement of the predictive power of molecular dynamics simulations for the determination of self-diffusion coefficient and viscosity demonstrated for propane<\/strong><br><strong>Authors: U. A. Higgoda, R. Hellmann, T. M. Koller, A. P. Fr\u00f6ba<\/strong><br><a href=\"https:\/\/doi.org\/10.1016\/j.fluid.2019.05.019\" rel='nofollow'>Fluid Phase Equilibria 496, 69\u201379 (2019).<\/a><\/p>\n\n\n\n<p><strong>Thermophysical properties of gaseous H<sub>2<\/sub>S\u2013N<sub>2<\/sub> mixtures from first-principles calculations<\/strong><br><strong>Author: R. Hellmann<\/strong><br><a href=\"https:\/\/doi.org\/10.1515\/zpch-2018-1250\" rel='nofollow'>Z. Phys. Chem. 233, 473\u2013491 (2019).<\/a><\/p>\n\n\n\n<p><strong>Cross second virial coefficients and dilute gas transport properties of the systems (CH<sub>4<\/sub> + C<sub>2<\/sub>H<sub>6<\/sub>) and (N<sub>2<\/sub> + C<sub>2<\/sub>H<sub>6<\/sub>) from accurate intermolecular potential energy surfaces<\/strong><br><strong>Author: R. Hellmann<\/strong><br><a rel=\"attachment wp-att-3068\" href=\"https:\/\/www.hsu-hh.de\/thermodynamik\/publikationen-zeitschriften-robert-hellmann-2\/jct_134_175_2019_author_version\">J. Chem. Thermodyn. 134, 175\u2013186 (2019).<\/a><\/p>\n\n\n\n<p><strong>Cross second virial coefficient and dilute gas transport properties of the (H<sub>2<\/sub>O + CO<sub>2<\/sub><\/strong><strong>) system from first-principles calculations<\/strong><br><strong>Author: R. Hellmann<\/strong><br><a href=\"https:\/\/www.hsu-hh.de\/thermodynamik\/publikationen-zeitschriften-robert-hellmann-2\/cross-second-virial-coefficient-and-dilute-gas-transport-properties-of-the-h2o-co2-system-from-first-principles-calculations\">Fluid Phase Equilibria 485, 251\u2013263 (2019); corrigendum: 518, 112624 (2020).<\/a><\/p>\n\n\n\n<p><strong>Self-diffusion coefficient and viscosity of methane and carbon dioxide via molecular dynamics simulations based on new <em>ab initio<\/em>-derived&nbsp;force fields<\/strong><br><strong>Authors: U. A. Higgoda, R. Hellmann, T. M. Koller, A. P. Fr\u00f6ba<\/strong><br><a href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S0378381218304278?via%3Dihub\" rel='nofollow'>Fluid Phase Equilibria 481, 15\u201327 (2019).<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2018<\/h2>\n\n\n\n<p><strong>Update: Reference correlation for the viscosity of ethane [J. Phys. Chem. Ref. Data 44, 043101 (2015)] <\/strong><br><strong>Authors: S. Herrmann, R. Hellmann, E. Vogel<\/strong><br><a href=\"https:\/\/aip.scitation.org\/doi\/pdf\/10.1063\/1.5037239?class=pdf\" rel='nofollow'>J. Phys. Chem. Ref. Data 47, 023103 (2018).<\/a><\/p>\n\n\n\n<p><strong><em>Ab initio<\/em> intermolecular potential energy surface for the CO<sub>2<\/sub>\u2013N<sub>2<\/sub> system and related thermophysical properties<\/strong><br><strong>Authors: J.-P. Crusius, R. Hellmann, J. C. Castro-Palacio, V. Vesovic<\/strong><br><a rel=\"attachment wp-att-2998\" href=\"https:\/\/www.hsu-hh.de\/thermodynamik\/publikationen-zeitschriften-robert-hellmann-2\/jcp_148_214306_2018\">J. Chem. Phys. 148, 214306 (2018).<\/a><\/p>\n\n\n\n<p><strong>Reference values for the second virial coefficient and three dilute gas transport properties of ethane from a state-of-the-art intermolecular potential energy surface<\/strong><br><strong>Author: R. Hellmann<\/strong><br><a href=\"https:\/\/pubs.acs.org\/doi\/10.1021\/acs.jced.7b01069\" rel='nofollow'>J. Chem. Eng. Data 63, 470\u2013481 (2018).<\/a><\/p>\n\n\n\n<p><strong>Cross second virial coefficients and dilute gas transport properties of the (CH<sub>4<\/sub> + C<sub>3<\/sub>H<sub>8<\/sub>) and (CO<sub>2<\/sub> + C<sub>3<\/sub>H<sub>8<\/sub>) systems from accurate intermolecular potential energy Surfaces<\/strong><br><strong>Author: R. Hellmann<\/strong><br><a href=\"https:\/\/pubs.acs.org\/doi\/10.1021\/acs.jced.7b00886\" rel='nofollow'>J. Chem. Eng. Data 63, 246\u2013257 (2018)&nbsp;&nbsp;(ACS Editors&#8216; Choice, Open Access).<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2017<\/h2>\n\n\n\n<p><strong>Virial coeficients of anisotropic hard solids of revolution: The detailed influence of the particle geometry<\/strong><br><strong>Authors: E. Herold, R. Hellmann, J. Wagner<\/strong><br><a href=\"https:\/\/www.hsu-hh.de\/thermodynamik\/publikationen-zeitschriften-robert-hellmann-2\/jcp_147_204102_2017\">J. Chem. Phys. 147, 204102 (2017)&nbsp;&nbsp;(Featured Article und Cover).<\/a><\/p>\n\n\n\n<p><strong>State-of-the-art <em>ab initio<\/em> potential energy curve for the xenon atom pair and related spectroscopic and thermophysical properties<\/strong><br><strong>Authors: R. Hellmann, B. J\u00e4ger, E. Bich<\/strong><br><a rel=\"attachment wp-att-3071\" href=\"https:\/\/www.hsu-hh.de\/thermodynamik\/publikationen-zeitschriften-robert-hellmann-2\/jcp_147_034304_2017\">J. Chem. Phys. 147, 034304 (2017).<\/a><\/p>\n\n\n\n<p><strong>Transport properties of dilute D<sub>2<\/sub>O vapour from first principles<\/strong><br><strong>Authors: R. Hellmann, E. Bich<\/strong><br><a href=\"https:\/\/www.hsu-hh.de\/thermodynamik\/publikationen-zeitschriften-robert-hellmann-2\/transport-properties-of-dilute-d2o-vapour-from-first-principles\">Mol. Phys. 115,1057\u20131064 (2017).<\/a><\/p>\n\n\n\n<p><strong>Intermolecular potential energy surface and thermophysical properties of propane<\/strong><br><strong>Author: R. Hellmann<\/strong><br><a href=\"https:\/\/www.hsu-hh.de\/thermodynamik\/publikationen-zeitschriften-robert-hellmann-2\/intermolecular-potential-energy-surface-and-thermophysical-properties-of-propane\">J. Chem. Phys. 146, 114304 (2017).<\/a><\/p>\n\n\n\n<p><strong>Nonadditive three-body potential and third to eighth virial coefficients of carbon dioxide<\/strong><br><strong>Author: R. Hellmann<\/strong><br><a href=\"https:\/\/www.hsu-hh.de\/thermodynamik\/publikationen-zeitschriften-robert-hellmann-2\/nonadditive-three-body-potential-and-third-to-eighth-virial-coefficients-of-carbon\">J. Chem. Phys. 146, 054302 (2017).<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2016<\/h2>\n\n\n\n<p><strong>Dilute gas viscosity of&nbsp;<em>n<\/em>-alkanes represented by rigid Lennard-Jones chains<\/strong><br><strong>Authors: J. C. Castro-Palacio, R. Hellmann, V. Vesovic<\/strong><br><a href=\"https:\/\/www.tandfonline.com\/doi\/full\/10.1080\/00268976.2016.1222456\" rel='nofollow'>Mol. Phys. 114, 3171\u20133182 (2016).<\/a><\/p>\n\n\n\n<p><strong>Cross second virial coefficients and dilute gas transport properties of the (CH<sub>4<\/sub> + CO<sub>2<\/sub>), (CH<sub>4<\/sub> + H<sub>2<\/sub>S), and (H<sub>2<\/sub>S + CO<sub>2<\/sub>) systems from accurate intermolecular potential energy surfaces<\/strong><br><strong>Authors: R. Hellmann, E. Bich, V. Vesovic<\/strong><br><a href=\"https:\/\/www.hsu-hh.de\/thermodynamik\/publikationen-zeitschriften-robert-hellmann-2\/cross-second-virial-coefficients-and-dilute-gas-transport-properties-of-the-ch4-c2h6-ch4-h2s-and-h2s-co2-system-from-accurate-intermolecular-potential-energy-surfaces\">J. Chem. Thermodyn. 102, 429\u2013441 (2016).<\/a><\/p>\n\n\n\n<p><strong>Calculation of the thermal conductivity of low-density CH<sub>4<\/sub>\u2013N<sub>2<\/sub> gas mixtures using an improved kinetic theory approach<\/strong><br><strong>Authors: R. Hellmann, E. Bich, V. Vesovic<\/strong><br><a href=\"https:\/\/www.hsu-hh.de\/thermodynamik\/publikationen-zeitschriften-robert-hellmann-2\/calculation-of-the-thermal-conductivity-of-low-density-ch4-n2-gas-mixtures-using-an-improved-kinetic-theory-approach-2\">J. Chem. Phys. 144, 134301 (2016).<\/a><\/p>\n\n\n\n<p><strong>State-of-the-art <em>ab initio<\/em> potential energy curve for the krypton atom pair and thermophysical properties of dilute krypton gas<\/strong><br><strong>Authors: B. J\u00e4ger, R. Hellmann, E. Bich, E. Vogel<\/strong><br><a href=\"https:\/\/www.hsu-hh.de\/thermodynamik\/publikationen-zeitschriften-robert-hellmann-2\/state-of-the-art-ab-initio-potential-energy-curve-for-the-krypton-atom-pair-and-thermophysical-properties-of-dilute-krypton-gas\">J. Chem. Phys. 144, 114304 (2016).<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2015<\/h2>\n\n\n\n<p><strong> The viscosity of dilute water vapor revisited: New reference values from experiment and theory for temperatures between (250 and 2500) K<\/strong><br><strong>Authors: R. Hellmann, E. Vogel<\/strong><br><a href=\"https:\/\/pubs.acs.org\/doi\/10.1021\/acs.jced.5b00599\" rel='nofollow'>J. Chem. Eng. Data 60, 3600\u20133605 (2015).<\/a><\/p>\n\n\n\n<p><strong>Influence of a magnetic field on the viscosity of a dilute gas consisting of linear molecules<\/strong><br><strong>Authors: R. Hellmann, V. Vesovic<\/strong><br><a href=\"https:\/\/www.hsu-hh.de\/thermodynamik\/publikationen-zeitschriften-robert-hellmann-2\/influence-of-a-magnetic-field-on-the-viscosity-of-a-dilute-gas-consisting-of-linear-molecules-2\">J. Chem. Phys. 143, 214303 (2015).<\/a><\/p>\n\n\n\n<p><strong><em>Ab initio<\/em> intermolecular potential energy surface and thermophysical properties of nitrous oxide<\/strong><br><strong>Authors: J.-P. Crusius, R. Hellmann, E. Hassel, E. Bich<\/strong><br><a href=\"https:\/\/www.hsu-hh.de\/thermodynamik\/publikationen-zeitschriften-robert-hellmann-2\/ab-initio-intermolecular-potential-energy-surface-and-thermophysical-properties-of-nitrous-oxide\">J. Chem. Phys. 142, 244307 (2015).<\/a><\/p>\n\n\n\n<p><strong>An improved kinetic theory approach for calculating the thermal conductivity of polyatomic gases<\/strong><br><strong>Authors: R. Hellmann, E. Bich<\/strong><br><a href=\"https:\/\/www.hsu-hh.de\/thermodynamik\/publikationen-zeitschriften-robert-hellmann-2\/an-improved-kinetic-theory-approach-for-calculating-the-thermal-2\">Mol. Phys. 113, 176\u2013183 (2015).<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2014<\/h2>\n\n\n\n<p><strong>Intermolecular potential energy surface and thermophysical properties of the CH<sub>4<\/sub>\u2013N<sub>2<\/sub> system<\/strong><br><strong>Authors: R. Hellmann, E. Bich, E. Vogel, V. Vesovic<\/strong><br><a href=\"https:\/\/www.hsu-hh.de\/thermodynamik\/publikationen-zeitschriften-robert-hellmann-2\/intermolecular-potential-energy-surface-and-thermophysical-properties-of-the-ch4-n2-system\">J. Chem. Phys. 141, 224301 (2014).<\/a><\/p>\n\n\n\n<p><strong>Intermolecular potential energy surface and thermophysical properties of ethylene oxide<\/strong><br><strong>Authors: J.-P. Crusius, R. Hellmann, E. Hassel, E. Bich<\/strong><br><a href=\"https:\/\/www.hsu-hh.de\/thermodynamik\/publikationen-zeitschriften-robert-hellmann-2\/intermolecular-potential-energy-surface-and-thermophysical-properties-of-ethylene-oxide\">J. Chem. Phys. 141, 164322 (2014).<\/a><\/p>\n\n\n\n<p><strong><em>Ab initio<\/em> potential energy surface for the carbon dioxide molecule pair and thermophysical properties of dilute carbon dioxide gas<\/strong><br><strong>Author: R. Hellmann<\/strong><br><a rel=\"attachment wp-att-3074\" href=\"https:\/\/www.hsu-hh.de\/thermodynamik\/publikationen-zeitschriften-robert-hellmann-2\/cpl_613_133_2014_author_version-2\">Chem. Phys. Lett. 613, 133\u2013138 (2014).<\/a><\/p>\n\n\n\n<p><strong>Can an <em>Ab Initio<\/em> Three-Body Virial Equation Describe the Mercury Gas Phase?<\/strong><br><strong>Authors: J. Wiebke, M. Wormit, R. Hellmann, E. Pahl, P. Schwerdtfeger<\/strong><br><a href=\"https:\/\/pubs.acs.org\/doi\/10.1021\/jp412260a\" rel='nofollow'>J. Phys. Chem. B 118, 3392\u20133400 (2014).<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2013<\/h2>\n\n\n\n<p><strong>Calculation of the relaxation properties of a dilute gas consisting of Lennard-Jones chains<\/strong><br><strong>Authors: R. Hellmann, N. Riesco, V. Vesovic<\/strong><br><a href=\"https:\/\/doi.org\/10.1016\/j.cplett.2013.04.067\" rel='nofollow'>Chem. Phys. Lett. 574, 37\u201341 (2013).<\/a><\/p>\n\n\n\n<p><strong>Calculation of the transport properties of a dilute gas consisting of Lennard-Jones chains<\/strong><br><strong>Authors: R. Hellmann, N. Riesco, V. Vesovic<\/strong><br><a href=\"https:\/\/www.hsu-hh.de\/thermodynamik\/publikationen-zeitschriften-robert-hellmann-2\/calculation-of-the-transport-properties-of-a-dilute-gas-consisting-of-lennard-jones-chains\">J. Chem. Phys. 138, 084309 (2013).<\/a><\/p>\n\n\n\n<p><strong><em>Ab initio<\/em> potential energy surface for the nitrogen molecule pair and thermophysical properties of nitrogen gas<\/strong><br><strong>Author: R. Hellmann<\/strong><br><a href=\"https:\/\/www.hsu-hh.de\/thermodynamik\/publikationen-zeitschriften-robert-hellmann-2\/ab-initio-potential-energy-surface-for-the-nitrogen-molecule-pair-and-thermophysical-properties-of-nitrogen-gas\">Mol. Phys. 111, 387\u2013401 (2013).<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2012<\/h2>\n\n\n\n<p><strong>New international formulation for the thermal conductivity of H<sub>2<\/sub>O<\/strong><br><strong>Authors: M. L. Huber, R. A. Perkins, D. G. Friend, J. V. Sengers, M. J. Assael, I. N. Metaxa, K. Miyagawa, R. Hellmann, E. Vogel<\/strong><br><a href=\"https:\/\/www.hsu-hh.de\/thermodynamik\/publikationen-zeitschriften-robert-hellmann-2\/new-international-formulation-for-the-thermal-conductivity-of-h2o\">J. Phys. Chem. Ref. Data 41, 033102 (2012).<\/a><\/p>\n\n\n\n<p><strong>Thermophysical properties of dilute hydrogen sulfide gas<\/strong><br><strong>Authors: R. Hellmann, E. Bich, E. Vogel, V. Vesovic<\/strong><br><a href=\"https:\/\/pubs.acs.org\/doi\/10.1021\/je3000926\" rel='nofollow'>J. Chem. Eng. Data 57, 1312\u20131317 (2012).<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2011<\/h2>\n\n\n\n<p><strong>Ionic liquids containing the triply negatively charged tricyanomelaminate anion and a B(C<sub>6<\/sub>F<sub>5<\/sub>)<sub>3<\/sub> adduct anion<\/strong><br><strong>Authors: K. Voss, M. Becker, A. Villinger, V. N. Emel&#8217;yanenko, R. Hellmann, B. Kirchner, F. Uhlig, S. P. Verevkin, A. Schulz<\/strong><br><a href=\"https:\/\/onlinelibrary.wiley.com\/doi\/full\/10.1002\/chem.201101946\" rel='nofollow'>Chem. Eur. J. 17, 13526\u201313537 (2011).<\/a><\/p>\n\n\n\n<p><strong><em>Ab initio<\/em> virial equation of state for argon using a new nonadditive three-body potential<\/strong><br><strong>Authors: B. J\u00e4ger, R. Hellmann, E. Bich, E. Vogel<\/strong><br><a href=\"https:\/\/www.hsu-hh.de\/thermodynamik\/publikationen-zeitschriften-robert-hellmann-2\/ab-initio-virial-equation-of-state-for-argon-using-a-new-nonadditive-three-body-potential-2\">J. Chem. Phys. 135, 084308 (2011).<\/a><\/p>\n\n\n\n<p><strong>A systematic formulation of the virial expansion for nonadditive interaction potentials<\/strong><br><strong>Authors: R. Hellmann, E. Bich<\/strong><br><a href=\"https:\/\/www.hsu-hh.de\/thermodynamik\/publikationen-zeitschriften-robert-hellmann-2\/a-systematic-formulation-of-the-virial-expansion-for-nonadditive-interaction-potentials\">J. Chem. Phys. 135, 084117 (2011).<\/a><\/p>\n\n\n\n<p><strong>The Kirkwood correlation factor of dense methanol as a function of temperature and pressure under isochoric conditions and its statistical mechanical treatment<\/strong><br><strong>Authors: J.-P. Crusius, R. Hellmann, A. Heintz<\/strong><br><a href=\"https:\/\/www.tandfonline.com\/doi\/abs\/10.1080\/00268976.2011.589989\" rel='nofollow'>Mol. Phys. 109, 1749\u20131757 (2011).<\/a><\/p>\n\n\n\n<p><strong><em>Ab initio<\/em> intermolecular potential energy surface and thermophysical properties of hydrogen sulfide<\/strong><br><strong>Authors: R. Hellmann, E. Bich, E. Vogel, V. Vesovic<\/strong><br><a href=\"https:\/\/www.hsu-hh.de\/thermodynamik\/publikationen-zeitschriften-robert-hellmann-2\/ab-initio-intermolecular-potential-energy-surface-and-thermophysical-properties-of-hydrogen-sulfide-2\">Phys. Chem. Chem. Phys. 13, 13749\u201313758 (2011).<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2010<\/h2>\n\n\n\n<p><strong><em>Ab initio<\/em>&nbsp;pair potential energy curve for the argon atom pair and thermophysical properties for the dilute argon gas. II. Thermophysical properties for low-density argon<\/strong><br><strong>Authors: E. Vogel, B. J\u00e4ger, R. Hellmann, E. Bich<\/strong><br><a href=\"https:\/\/www.tandfonline.com\/doi\/abs\/10.1080\/00268976.2010.507557\" rel='nofollow'>Mol. Phys. 108, 3335\u20133352 (2010).<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2009<\/h2>\n\n\n\n<p><strong><em>Ab initio<\/em>&nbsp;pair potential energy curve for the argon atom pair and thermophysical properties of the dilute argon gas. I. Argon-argon interatomic potential and rovibrational spectra<\/strong><br><strong>Authors: B. J\u00e4ger, R. Hellmann, E. Bich, E. Vogel<\/strong><br><a href=\"https:\/\/www.tandfonline.com\/doi\/abs\/10.1080\/00268970903213305\" rel='nofollow'>Mol. Phys. 107, 2181\u20132188 (2009)<\/a>; <a href=\"https:\/\/www.tandfonline.com\/doi\/full\/10.1080\/00268970903444744\" rel='nofollow'>Corrigendum: 108, 105 (2010).<\/a><\/p>\n\n\n\n<p><strong>Contributions of multipolar polarizabilities to the isotropic and anisotropic light scattering induced by molecular interactions in gaseous methane<\/strong><br><strong>Authors: M. S. A. El-Kader, S. M. El-Sheikh, T. Bancewicz, R. Hellmann<\/strong><br><a href=\"https:\/\/www.hsu-hh.de\/thermodynamik\/publikationen-zeitschriften-robert-hellmann-2\/contributions-of-multipolar-polarizabilities-to-the-isotropic-and-anisotropic-light-scattering-induced-by-molecular-interactions-in-gaseous-methane-2\">J. Chem. Phys. 131, 044314 (2009).<\/a><\/p>\n\n\n\n<p><strong>Calculation of the transport and relaxation properties of dilute water vapor<br>Authors: R. Hellmann, E. Bich, E. Vogel, A. S. Dickinson, V. Vesovic<\/strong><br><a href=\"https:\/\/www.hsu-hh.de\/thermodynamik\/publikationen-zeitschriften-robert-hellmann-2\/calculation-of-the-transport-and-relaxation-properties-of-dilute-water-vapor\">J. Chem. Phys. 131, 014303 (2009).<\/a><\/p>\n\n\n\n<p><strong>Synthesis, structure, and bonding of weakly coordinating anions based on CN adducts<\/strong><br><strong>Authors: A. Bernsdorf, H. Brand, R. Hellmann, M. K\u00f6ckerling, A. Schulz, A. Villinger, K. Voss<\/strong><br><a href=\"https:\/\/pubs.acs.org\/doi\/10.1021\/ja902450b\" rel='nofollow'>J. Am. Chem. Soc. 131, 8958\u20138970 (2009).<\/a><\/p>\n\n\n\n<p><strong>Calculation of the transport and relaxation properties of methane. II. Thermal conductivity, thermomagnetic effects, volume viscosity, and nuclear-spin relaxation<\/strong><br><strong>Authors: R. Hellmann, E. Bich, E. Vogel, A. S. Dickinson, V. Vesovic<\/strong><br><a href=\"https:\/\/www.hsu-hh.de\/thermodynamik\/publikationen-zeitschriften-robert-hellmann-2\/calculation-of-the-transport-and-relaxation-properties-of-methane-ii-thermal-conductivity-thermomagnetic-effects-volume-viscosity-and-nuclear-spin-relaxation-4\">J. Chem. Phys. 130, 124309 (2009).<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2008<\/h2>\n\n\n\n<p><strong>Calculation of the transport and relaxation properties of methane. I. Shear viscosity, viscomagnetic effects, and self-diffusion<\/strong><br><strong>Authors: R. Hellmann, E. Bich, E. Vogel, A. S. Dickinson, V. Vesovic<\/strong><br><a href=\"https:\/\/www.hsu-hh.de\/thermodynamik\/publikationen-zeitschriften-robert-hellmann-2\/calculation-of-the-transport-and-relaxation-properties-of-methane-i-shear-viscosity-viscomagnetic-effects-and-self-diffusion\">J. Chem. Phys. 129, 064302 (2008).<\/a><\/p>\n\n\n\n<p><strong><em>Ab initio<\/em> intermolecular potential energy surface and second pressure virial coefficients of methane<\/strong><br><strong>Authors: R. Hellmann, E. Bich, E. Vogel<\/strong><br><a href=\"https:\/\/www.hsu-hh.de\/thermodynamik\/publikationen-zeitschriften-robert-hellmann-2\/ab-initio-intermolecular-potential-energy-surface-and-second-pressure-virial-coefficients-of-methane-2\">J. Chem. Phys. 128, 214303 (2008).<\/a><\/p>\n\n\n\n<p><strong><em>Ab initio<\/em> potential energy curve for the neon atom pair and thermophysical properties of the dilute neon gas. II. Thermophysical properties for low-density neon<\/strong><br><strong>Authors: E. Bich, R. Hellmann, E. Vogel<\/strong><br><a href=\"https:\/\/www.tandfonline.com\/doi\/full\/10.1080\/00268970802302662\" rel='nofollow'>Mol. Phys. 106, 1107\u20131122 (2008).<\/a><\/p>\n\n\n\n<p><strong><em>Ab initio<\/em> potential energy curve for the neon atom pair and thermophysical properties of the dilute neon gas. I. Neon-neon interatomic potential and rovibrational spectra<\/strong><br><strong>Authors: R. Hellmann, E. Bich, E. Vogel<\/strong><br><a href=\"https:\/\/www.tandfonline.com\/doi\/abs\/10.1080\/00268970701843147\" rel='nofollow'>Mol. Phys. 106, 133\u2013140 (2008).<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2007<\/h2>\n\n\n\n<p><strong><em>Ab initio<\/em>&nbsp;potential energy curve for the helium atom pair and thermophysical properties of the dilute helium gas. II. Thermophysical standard values for low-density helium<\/strong><br><strong>Authors: E. Bich, R. Hellmann, E. Vogel<\/strong><br><a href=\"https:\/\/www.tandfonline.com\/doi\/abs\/10.1080\/00268970701744584\" rel='nofollow'>Mol. Phys. 105, 3035\u20133049 (2007).<\/a><\/p>\n\n\n\n<p><strong><em>Ab initio<\/em> potential energy curve for the helium atom pair and thermophysical properties of dilute helium gas. I. Helium-helium interatomic potential<\/strong><br><strong>Authors: R. Hellmann, E. Bich, E. Vogel<\/strong><br><a href=\"https:\/\/www.tandfonline.com\/doi\/abs\/10.1080\/00268970701730096\" rel='nofollow'>Mol. Phys. 105, 3013\u20133023 (2007).<\/a><\/p>\n\n\n\n<p><strong>Transport properties of asymmetric-top molecules<\/strong><br><strong>Authors: A. S. Dickinson, R. Hellmann, E. Bich, E. Vogel<\/strong><br><a href=\"https:\/\/www.hsu-hh.de\/thermodynamik\/publikationen-zeitschriften-robert-hellmann-2\/transport-properties-of-asymmetric-top-molecules-2\">Phys. Chem. Chem. Phys. 9, 2836\u20132843 (2007).<\/a><\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>(last updated 03\/2026) 2026 Third and fourth density and acoustic virial coefficients of neon from first-principles calculationsAuthors: R. Hellmann, G. GarberoglioJ. Chem. Phys. 164, 124302 (2026). 2025 Cross Second Virial [&hellip;]<\/p>\n","protected":false},"author":53,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"categories":[72],"tags":[],"class_list":["post-4146","page","type-page","status-publish","hentry","category-publications"],"_links":{"self":[{"href":"https:\/\/www.hsu-hh.de\/thermodynamik\/wp-json\/wp\/v2\/pages\/4146","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.hsu-hh.de\/thermodynamik\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.hsu-hh.de\/thermodynamik\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.hsu-hh.de\/thermodynamik\/wp-json\/wp\/v2\/users\/53"}],"replies":[{"embeddable":true,"href":"https:\/\/www.hsu-hh.de\/thermodynamik\/wp-json\/wp\/v2\/comments?post=4146"}],"version-history":[{"count":48,"href":"https:\/\/www.hsu-hh.de\/thermodynamik\/wp-json\/wp\/v2\/pages\/4146\/revisions"}],"predecessor-version":[{"id":5214,"href":"https:\/\/www.hsu-hh.de\/thermodynamik\/wp-json\/wp\/v2\/pages\/4146\/revisions\/5214"}],"wp:attachment":[{"href":"https:\/\/www.hsu-hh.de\/thermodynamik\/wp-json\/wp\/v2\/media?parent=4146"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.hsu-hh.de\/thermodynamik\/wp-json\/wp\/v2\/categories?post=4146"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.hsu-hh.de\/thermodynamik\/wp-json\/wp\/v2\/tags?post=4146"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}