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Fluid hydrogen at high density - Pressure dissociationA model for the Helmholtz free energy of fluid hydrogen at high density and high temperature is developed. This model aims at describing both pressure and temperature dissociation and ionization and bears directly on equations of state of partially ionized plasmas, as encountered in astrophysical situations and high-pressure experiments. This paper focuses on a mixture of hydrogen atoms and molecules and is devoted to the study of the phenomenon of pressure dissociation at finite temperatures. In the present model, the strong interactions are described with realistic potentials and are computed with a modified Weeks-Chandler-Andersen fluid perturbation theory that reproduces Monte Carlo simulations to better than 3 percent. Theoretical Hugoniot curves derived from the model are in excellent agreement with experimental data.
Document ID
19920030614
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Saumon, Didier
(Arizona, University Tucson, United States)
Chabrier, Gilles
(Lyon Ecole Normale Superieure, Lyons, France)
Date Acquired
August 15, 2013
Publication Date
October 15, 1991
Publication Information
Publication: Physical Review A
Volume: 44
ISSN: 1050-2947
Subject Category
Plasma Physics
Accession Number
92A13238
Funding Number(s)
CONTRACT_GRANT: NSF AST-87-06711
CONTRACT_GRANT: NSF PHY-88-08146
CONTRACT_GRANT: NAGW-1476
Distribution Limits
Public
Copyright
Other

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