Fluid hydrogen at high density - Pressure ionization

Details Fluid hydrogen at high density - Pressure ionization Fluid hydrogen at high density - Pressure ionization

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992phrva..46.2084s&link_type=abstract

Physical Review A (ISSN 1050-2947), vol. 46, no. 4, Aug. 15, 1992, p. 2084-2100. Research supported by NSERC.

Astronomy and Astrophysics

Astrophysics

157

Chemical Equilibrium, Gas Ionization, Hydrogen Atoms, Hydrogen Ions, Liquid Hydrogen, Molecular Gases, Free Energy, Interatomic Forces, Pressure Effects, Saha Equations

Scientific paper

The Helmholtz-free-energy model for nonideal mixtures of hydrogen atoms and molecules by Saumon and Chabrier (1991) is extended to describe dissociation and ionization in similar mixtures in chemical equilibrium. A free-energy model is given that describes partial ionization in the pressure and temperature ionization region. The plasma-phase transition predicted by the model is described for hydrogen mixtures including such components as H2, H, H(+), and e(-). The plasma-phase transition has a critical point at Tc = 15,300 K and Pc = 0.614 Mbar, and thermodynamic instability is noted in the pressure-ionization regime. The pressure dissociation and ionization of fluid hydrogen are described well with the model yielding information on the nature of the plasma-phase transition. The model is shown to be valuable for studying dissociation and ionization in astrophysical objects and in high-pressure studies where pressure and temperature effects are significant.

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