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  • Energy Levels Hydrogen

    Description:
    Rovibrational energies of the hydrogen molecule in the electronic ground state have been derived from a complete vacuum ultraviolet (VUV) spectrum. This purely experimentally based approach has been chosen to compare experimentally based quantum-mechanical predictions for caloric properties of hydrogen in the ideal-gas state with approaches fitting smoothing functions to IR data and with ab-initio calculations of rovibrational energy levels. Results of this comparison were found to agree essentially within 0.01% in the isobaric heat capacity and give an indication for the uncertainty ideal gas properties. The given energy levels allow for the calculation of properties of ortho, para and normal hydrogen as well as for calculations regarding the equilibrium ortho / para distribution as a function of temperature. The results form the basis for the development of a numerically less demanding empirical representation of the ideal gas properties as basis for the development of a new reference equation of state.
    Keyword:
    Hydrogen, Ideal Gas Properties, and Rovibrational Energy Levels
    Publisher:
    Date Uploaded:
    2025-05-22
    Date Modified:
    2025-05-27
    License:
    Creative Commons CC0 1.0 Universal
    Resource Type:
    Dataset

  • Viscosity Measurements H2 and H2-Mixtures

    Description:
    This data set contains viscosity measurements for hydrogen and for mixtures containing hydrogen and components relevant for blue-hydrogen production. Measurements were carried out with highly accurate gas-phase viscometers utilizing magnetic-suspension technology. Results are published in Betken, Benjamin; Khosravi, Bahareh; Sabozin, Fabian; Thol, Monika; Span, Roland; ,"Measurements of the Viscosity of n-Hydrogen and (n-Hydrogen+ Carbon Dioxide),(n-Hydrogen+ Methane), and (n-Hydrogen+ Ethane) Mixtures at Temperatures from (253.15 to 473.15) K and at Pressures up to 20 MPa",International Journal of Thermophysics,46,4,55,2025,Springer US New York
    Keyword:
    Hydrogen / Carbon Dioxide, Viscosity, Hydrogen / Methane, Viscosity Measurements, Hydrogen, Hydrogen / Ethane, and Gas Phase
    Publisher:
    Date Uploaded:
    2025-05-22
    Date Modified:
    2025-05-27
    License:
    Creative Commons CC0 1.0 Universal
    Resource Type:
    Dataset