Abstract
The aim of this research is to apply the author’s original computer aided analysis of thermophysical data for pure fluids to noble gases to investigate the unknown aspects in their equilibrium thermal physics. The methodology of the analysis is based on the potential energy density series expansion by the monomer fraction density. To discover the important details and particular features of pair atomic interactions in noble gases, the preprocessed and generalized experimental data have been taken from the US National Institute of Standards and Technology (NIST) online database. In this work the temperature range for analysis of the dimers’ bonding parameters is extended as compared to previous author’s works due to accounting for the specific temperature dependence of the repulsions’ contribution to the potential energy. The found temperature dependences of the pair interaction bond energies signal about the hindered rotation of atoms in dimers near the triple point due to the lack of rotational symmetry of their electronic outer shells. The discovered mutually correlated anomalous temperature dependences of the pair bond energy and the constant volume heat capacity in gaseous Helium require a special investigation of this remarkable phenomenon.
Highlights
The problem in the equilibrium thermal physics of real gases is connected with the interpretation of experimental data via virial expansions [7,8] of thermophysical data utilizing the total densities or pressures of real gases as arguments for series expansions
The virial expansions are very useful in practice: they help to generalize experimental data and to provide the mathematical models for the technology control
Their physical interpretation should be performed with a due care
Summary
The problem in the equilibrium thermal physics of real gases is connected with the interpretation of experimental data via virial expansions [7,8] of thermophysical data utilizing the total densities or pressures of real gases as arguments for series expansions. The virial expansions are very useful in practice: they help to generalize experimental data and to provide the mathematical models for the technology control. Their physical interpretation should be performed with a due care. It is important to admit that the high order virial coefficients depend on the interactions between smaller clusters and even monomers because the total values of density and pressure are combinations of partial values for different cluster fractions.
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