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- W4231317672 startingPage "2084" @default.
- W4231317672 abstract "In an earlier paper [Phys. Rev. A 44, 5122 (1991)], we presented a Helmholtz-free-energy model for nonideal mixtures of hydrogen atoms and molecules. In the present paper, we extend this model to describe an interacting mixture of ${mathrm{H}}_{2}$, H, ${mathrm{H}}^{+}$, and ${mathit{e}}^{mathrm{ensuremath{-}}}$ in chemical equilibrium. This general model describes the phenomena of dissociation and ionization caused by pressure and temperature effects, as encountered in astrophysical situations and high-pressure experiments. The present model is thermodynamically unstable in the pressure-ionization regime and predicts the existence of a plasma phase transition with a critical point at ${mathit{T}}_{mathit{c}}$=15 300 K, ${mathit{P}}_{mathit{c}}$=0.614 Mbar, and ${mathrm{ensuremath{rho}}}_{mathit{c}}$=0.35 g/${mathrm{cm}}^{3}$. The transition occurs between a weakly ionized phase and a partially (ensuremath{approxeq}50%) ionized phase. Molecular dissociation and pressure ionization occur in the same narrow density range; atoms play a minor role in pressure ionization. In the high-density phase, complete pressure ionization is reached gradually. The sensitivity of the coexistence curve and of the critical point to model parameters and assumptions is discussed in detail." @default.
- W4231317672 created "2022-05-12" @default.
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- W4231317672 date "1992-08-01" @default.
- W4231317672 modified "2023-10-18" @default.
- W4231317672 title "Fluid hydrogen at high density: Pressure ionization" @default.
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- W4231317672 doi "https://doi.org/10.1103/physreva.46.2084" @default.
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