(Stand 08/2024)
2024
Speed of sound measurements and derived third and fourth acoustic virial coefficients of supercritical neon
Autoren: T. Dietl, A. El Hawary, R. M. Gavioso, R. Hellmann, K. Meier
Metrologia 61, 045007 (2024).
Cross Second and Third Virial Coefficients and Dilute Gas Transport Properties of the (H2O + Ar) System from First-Principles Calculations
Autor: R. Hellmann
J. Chem. Eng. Data 69, 942-957 (2024).
2023
Cross Second Virial Coefficients of the H2O–H2 and H2S–H2 Systems from First-Principles
Autor: R. Hellmann
J. Chem. Eng. Data 68, 2212–2222 (2023) (Open Access).
Ab initio potential energy surfaces for the O2–O2 system and derived thermophysical properties
Autor: R. Hellmann
J. Chem. Phys. 159, 104303 (2023) (Open Access).
Ab Initio Calculation of Fluid Properties for Precision Metrology
Autoren: G. Garberoglio, C. Gaiser, R. M. Gavioso, A. H. Harvey, R. Hellmann, B. Jeziorski, K. Meier,
M. R. Moldover, L. Pitre, K. Szalewicz, R. Underwood
J. Phys. Chem. Ref. Data 52, 031502 (2023) (Open Access).
Determination of the Binary Diffusion Coefficients and Interaction Viscosities of the Systems Carbon Dioxide–Nitrogen and Ethane–Methane in the Dilute Gas Phase from Accurate Experimental Viscosity Data Using the Kinetic Theory of Gases
Autoren: E. Vogel, E. Bich, R. Hellmann
Int. J. Thermophys. 44, 129 (2023).
Cross second virial coefficients of the H2O–H2S and H2O–SO2 systems from first principles
Autor: R. Hellmann
J. Chem. Eng. Data 68, 108-117 (2023).
2022
Thermodynamic properties of krypton from Monte Carlo simulations using ab initio potentials
Autoren: P. Ströker, R. Hellmann, K. Meier
J. Chem. Phys. 157, 114504 (2022)
Thermodynamic properties of argon from Monte Carlo simulations using ab initio potentials
Autoren: P. Ströker, R. Hellmann, K. Meier
Phys. Rev. E 105, 064129 (2022).
Eighth-Order Virial Equation of State for Methane from Accurate Two-Body and Nonadditive Three-Body Intermolecular Potentials
Autor: R. Hellmann
J. Phys. Chem. B 126, 3920-3930 (2022).
New International Formulation for the Thermal Conductivity of Heavy Water
Autoren: M. L. Huber, R. A. Perkins, M. J. Assael, S. A. Monogenidou, R. Hellmann, J. V. Sengers
J. Phys. Chem. Ref. Data 51, 013102 (2022).
Ab initio determination of the polarizability of neon
Autor: R. Hellmann
Phys. Rev. A 105, 022809 (2022).
Cross Second Virial Coefficient of the H2O–CO System from a New Ab Initio Pair Potential
Autor: R. Hellmann
Int. J. Thermophys. 43, 25 (2022) (Open Access).
2021
Calculation of third to eighth virial coefficients of hard lenses and hard, oblate ellipsoids of revolution employing an efficient algorithm
Autoren: P. Marienhagen, R. Hellmann, J. Wagner
Phys. Rev. E 104, 015308 (2021).
Thermophysical properties of low-density neon gas from highly accurate first-principles calculations and dielectric-constant gas thermometry measurements
Autoren: R. Hellmann, C. Gaiser, B. Fellmuth, T. Vasyltsova, E. Bich
J. Chem. Phys. 154, 164304 (2021).
First‐Principles Diffusivity Ratios for Atmospheric Isotope Fractionation on Mars and Titan
Autoren: R. Hellmann, A. H. Harvey
J. Geophys. Res. Planets 126, e2021JE006857 (2021) (Open Access).
Systematic formulation of thermodynamic properties in the NpT ensemble
Autoren: P. Ströker, R. Hellmann, K. Meier
Phys. Rev. E 103, 023305 (2021).
2020
First‐Principles Diffusivity Ratios for Kinetic Isotope Fractionation of Water in Air
Autoren: R. Hellmann, A. H. Harvey
Geophys. Res. Lett. 47, e2020GL089999 (2020) (Open Access).
Cross Second Virial Coefficients and Dilute Gas Transport Properties of the Systems (N2+ C3H8), (C2H6 + C3H8), and (H2S + C3H8) from Ab Initio-Based Intermolecular Potentials
Autor: R. Hellmann
J. Chem. Eng. Data 65, 4712–4724 (2020).
Reference Values for the Cross Second Virial Coefficients and Dilute Gas Binary Diffusion Coefficients of the Systems (H2O + O2) and (H2O + Air) from First Principles
Autor: R. Hellmann
J. Chem. Eng. Data 65, 4130–4141 (2020).
Zero-density limit of the residual entropy scaling of transport properties
Autoren: I. H. Bell, R. Hellmann, A. H. Harvey
J. Chem. Eng. Data 65, 1038–1050 (2020).
Cross second virial coefficients and dilute gas transport properties of the systems (CO2 + C2H6) and (H2S + C2H6) from accurate intermolecular potential energy surfaces
Autor: R. Hellmann
J. Chem. Eng. Data 65, 968–979 (2020).
2019
First-Principles Calculation of the Cross Second Virial Coefficient and the Dilute Gas Shear Viscosity, Thermal Conductivity, and Binary Diffusion Coefficient of the (H2O + N2) System
Autor: R. Hellmann
J. Chem. Eng. Data 64, 5959–5973 (2019); correction: 65, 2251–2252 (2020).
Eighth-order virial equation of state and speed-of-sound measurements for krypton
Autoren: A. El Hawary, R. Hellmann, K. Meier, H. Busemann
J. Chem. Phys. 151, 154303 (2019).
Thermal conductivity via entropy scaling: An approach that captures the effect of intramolecular degrees of freedom
Autoren: M. Hopp, J. Mele, R. Hellmann, J. Gross
Ind. Eng. Chem. Res. 58, 18432–18438 (2019).
Fick diffusion coefficients of binary fluid mixtures consisting of methane, carbon dioxide, and propane via molecular dynamics simulations based on simplified pair-specific ab initio-derived force fields
Autoren: U. A. Higgoda, C. J. Kankanamge, R. Hellmann, T. M. Koller, A. P. Fröba
Fluid Phase Equilibria 502, 112257 (2019).
Enhancement of the predictive power of molecular dynamics simulations for the determination of self-diffusion coefficient and viscosity demonstrated for propane
Autoren: U. A. Higgoda, R. Hellmann, T. M. Koller, A. P. Fröba
Fluid Phase Equilibria 496, 69–79 (2019).
Thermophysical properties of gaseous H2S–N2 mixtures from first-principles calculations
Autor: R. Hellmann
Z. Phys. Chem. 233, 473–491 (2019).
Cross second virial coefficients and dilute gas transport properties of the systems (CH4 + C2H6) and (N2 + C2H6) from accurate intermolecular potential energy surfaces
Autor: R. Hellmann
J. Chem. Thermodyn. 134, 175–186 (2019).
Cross second virial coefficient and dilute gas transport properties of the (H2O + CO2) system from first-principles calculations
Autor: R. Hellmann
Fluid Phase Equilibria 485, 251–263 (2019); corrigendum: 518, 112624 (2020).
Self-diffusion coefficient and viscosity of methane and carbon dioxide via molecular dynamics simulations based on new ab initio-derived force fields
Autoren: U. A. Higgoda, R. Hellmann, T. M. Koller, A. P. Fröba
Fluid Phase Equilibria 481, 15–27 (2019).
2018
Update: Reference correlation for the viscosity of ethane [J. Phys. Chem. Ref. Data 44, 043101 (2015)]
Autoren: S. Herrmann, R. Hellmann, E. Vogel
J. Phys. Chem. Ref. Data 47, 023103 (2018).
Ab initio intermolecular potential energy surface for the CO2–N2 system and related thermophysical properties
Autoren: J.-P. Crusius, R. Hellmann, J. C. Castro-Palacio, V. Vesovic
J. Chem. Phys. 148, 214306 (2018).
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
Autor: R. Hellmann
J. Chem. Eng. Data 63, 470–481 (2018).
Cross second virial coefficients and dilute gas transport properties of the (CH4 + C3H8) and (CO2 + C3H8) systems from accurate intermolecular potential energy Surfaces
Autor: R. Hellmann
J. Chem. Eng. Data 63, 246–257 (2018) (ACS Editors‘ Choice, Open Access).
2017
Virial coeficients of anisotropic hard solids of revolution: The detailed influence of the particle geometry
Autoren: E. Herold, R. Hellmann, J. Wagner
J. Chem. Phys. 147, 204102 (2017) (Featured Article und Cover).
State-of-the-art ab initio potential energy curve for the xenon atom pair and related spectroscopic and thermophysical properties
Autoren: R. Hellmann, B. Jäger, E. Bich
J. Chem. Phys. 147, 034304 (2017).
Transport properties of dilute D2O vapour from first principles
Autoren: R. Hellmann, E. Bich
Mol. Phys. 115,1057–1064 (2017).
Intermolecular potential energy surface and thermophysical properties of propane
Autor: R. Hellmann
J. Chem. Phys. 146, 114304 (2017).
Nonadditive three-body potential and third to eighth virial coefficients of carbon dioxide
Autor: R. Hellmann
J. Chem. Phys. 146, 054302 (2017).
2016
Dilute gas viscosity of n-alkanes represented by rigid Lennard-Jones chains
Autoren: J. C. Castro-Palacio, R. Hellmann, V. Vesovic
Mol. Phys. 114, 3171–3182 (2016).
Cross second virial coefficients and dilute gas transport properties of the (CH4 + CO2), (CH4 + H2S), and (H2S + CO2) systems from accurate intermolecular potential energy surfaces
Autoren: R. Hellmann, E. Bich, V. Vesovic
J. Chem. Thermodyn. 102, 429–441 (2016).
Calculation of the thermal conductivity of low-density CH4–N2 gas mixtures using an improved kinetic theory approach
Autoren: R. Hellmann, E. Bich, V. Vesovic
J. Chem. Phys. 144, 134301 (2016).
State-of-the-art ab initio potential energy curve for the krypton atom pair and thermophysical properties of dilute krypton gas
Autoren: B. Jäger, R. Hellmann, E. Bich, E. Vogel
J. Chem. Phys. 144, 114304 (2016).
2015
The viscosity of dilute water vapor revisited: New reference values from experiment and theory for temperatures between (250 and 2500) K
Autoren: R. Hellmann, E. Vogel
J. Chem. Eng. Data 60, 3600–3605 (2015).
Influence of a magnetic field on the viscosity of a dilute gas consisting of linear molecules
Autoren: R. Hellmann, V. Vesovic
J. Chem. Phys. 143, 214303 (2015).
Ab initio intermolecular potential energy surface and thermophysical properties of nitrous oxide
Autoren: J.-P. Crusius, R. Hellmann, E. Hassel, E. Bich
J. Chem. Phys. 142, 244307 (2015).
An improved kinetic theory approach for calculating the thermal conductivity of polyatomic gases
Autoren: R. Hellmann, E. Bich
Mol. Phys. 113, 176–183 (2015).
2014
Intermolecular potential energy surface and thermophysical properties of the CH4–N2 system
Autoren: R. Hellmann, E. Bich, E. Vogel, V. Vesovic
J. Chem. Phys. 141, 224301 (2014).
Intermolecular potential energy surface and thermophysical properties of ethylene oxide
Autoren: J.-P. Crusius, R. Hellmann, E. Hassel, E. Bich
J. Chem. Phys. 141, 164322 (2014).
Ab initio potential energy surface for the carbon dioxide molecule pair and thermophysical properties of dilute carbon dioxide gas
Autor: R. Hellmann
Chem. Phys. Lett. 613, 133–138 (2014).
Can an Ab Initio Three-Body Virial Equation Describe the Mercury Gas Phase?
Autoren: J. Wiebke, M. Wormit, R. Hellmann, E. Pahl, P. Schwerdtfeger
J. Phys. Chem. B 118, 3392–3400 (2014).
2013
Calculation of the relaxation properties of a dilute gas consisting of Lennard-Jones chains
Autoren: R. Hellmann, N. Riesco, V. Vesovic
Chem. Phys. Lett. 574, 37–41 (2013).
Calculation of the transport properties of a dilute gas consisting of Lennard-Jones chains
Autoren: R. Hellmann, N. Riesco, V. Vesovic
J. Chem. Phys. 138, 084309 (2013).
Ab initio potential energy surface for the nitrogen molecule pair and thermophysical properties of nitrogen gas
Autor: R. Hellmann
Mol. Phys. 111, 387–401 (2013).
2012
New international formulation for the thermal conductivity of H2O
Autoren: M. L. Huber, R. A. Perkins, D. G. Friend, J. V. Sengers, M. J. Assael, I. N. Metaxa, K. Miyagawa, R. Hellmann, E. Vogel
J. Phys. Chem. Ref. Data 41, 033102 (2012).
Thermophysical properties of dilute hydrogen sulfide gas
Autoren: R. Hellmann, E. Bich, E. Vogel, V. Vesovic
J. Chem. Eng. Data 57, 1312–1317 (2012).
2011
Ionic liquids containing the triply negatively charged tricyanomelaminate anion and a B(C6F5)3 adduct anion
Autoren: K. Voss, M. Becker, A. Villinger, V. N. Emel’yanenko, R. Hellmann, B. Kirchner, F. Uhlig, S. P. Verevkin, A. Schulz
Chem. Eur. J. 17, 13526–13537 (2011).
Ab initio virial equation of state for argon using a new nonadditive three-body potential
Autoren: B. Jäger, R. Hellmann, E. Bich, E. Vogel
J. Chem. Phys. 135, 084308 (2011).
A systematic formulation of the virial expansion for nonadditive interaction potentials
Autoren: R. Hellmann, E. Bich
J. Chem. Phys. 135, 084117 (2011).
The Kirkwood correlation factor of dense methanol as a function of temperature and pressure under isochoric conditions and its statistical mechanical treatment
Autoren: J.-P. Crusius, R. Hellmann, A. Heintz
Mol. Phys. 109, 1749–1757 (2011).
Ab initio intermolecular potential energy surface and thermophysical properties of hydrogen sulfide
Autoren: R. Hellmann, E. Bich, E. Vogel, V. Vesovic
Phys. Chem. Chem. Phys. 13, 13749–13758 (2011).
2010
Ab initio pair potential energy curve for the argon atom pair and thermophysical properties for the dilute argon gas. II. Thermophysical properties for low-density argon
Autoren: E. Vogel, B. Jäger, R. Hellmann, E. Bich
Mol. Phys. 108, 3335–3352 (2010).
2009
Ab initio 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
Autoren: B. Jäger, R. Hellmann, E. Bich, E. Vogel
Mol. Phys. 107, 2181–2188 (2009); Corrigendum: 108, 105 (2010).
Contributions of multipolar polarizabilities to the isotropic and anisotropic light scattering induced by molecular interactions in gaseous methane
Autoren: M. S. A. El-Kader, S. M. El-Sheikh, T. Bancewicz, R. Hellmann
J. Chem. Phys. 131, 044314 (2009).
Calculation of the transport and relaxation properties of dilute water vapor
Autoren: R. Hellmann, E. Bich, E. Vogel, A. S. Dickinson, V. Vesovic
J. Chem. Phys. 131, 014303 (2009).
Synthesis, structure, and bonding of weakly coordinating anions based on CN adducts
Autoren: A. Bernsdorf, H. Brand, R. Hellmann, M. Köckerling, A. Schulz, A. Villinger, K. Voss
J. Am. Chem. Soc. 131, 8958–8970 (2009).
Calculation of the transport and relaxation properties of methane. II. Thermal conductivity, thermomagnetic effects, volume viscosity, and nuclear-spin relaxation
Autoren: R. Hellmann, E. Bich, E. Vogel, A. S. Dickinson, V. Vesovic
J. Chem. Phys. 130, 124309 (2009).
2008
Calculation of the transport and relaxation properties of methane. I. Shear viscosity, viscomagnetic effects, and self-diffusion
Autoren: R. Hellmann, E. Bich, E. Vogel, A. S. Dickinson, V. Vesovic
J. Chem. Phys. 129, 064302 (2008).
Ab initio intermolecular potential energy surface and second pressure virial coefficients of methane
Autoren: R. Hellmann, E. Bich, E. Vogel
J. Chem. Phys. 128, 214303 (2008).
Ab initio potential energy curve for the neon atom pair and thermophysical properties of the dilute neon gas. II. Thermophysical properties for low-density neon
Autoren: E. Bich, R. Hellmann, E. Vogel
Mol. Phys. 106, 1107–1122 (2008).
Ab initio potential energy curve for the neon atom pair and thermophysical properties of the dilute neon gas. I. Neon-neon interatomic potential and rovibrational spectra
Autoren: R. Hellmann, E. Bich, E. Vogel
Mol. Phys. 106, 133–140 (2008).
2007
Ab initio potential energy curve for the helium atom pair and thermophysical properties of the dilute helium gas. II. Thermophysical standard values for low-density helium
Autoren: E. Bich, R. Hellmann, E. Vogel
Mol. Phys. 105, 3035–3049 (2007).
Ab initio potential energy curve for the helium atom pair and thermophysical properties of dilute helium gas. I. Helium-helium interatomic potential
Autoren: R. Hellmann, E. Bich, E. Vogel
Mol. Phys. 105, 3013–3023 (2007).
Transport properties of asymmetric-top molecules
Autoren: A. S. Dickinson, R. Hellmann, E. Bich, E. Vogel
Phys. Chem. Chem. Phys. 9, 2836–2843 (2007).
Letzte Änderung: 26. August 2024