Thermodynamics of ionization and dissociation in hydrogen plasmas including fluctuations and magnetic fields

Details Thermodynamics of ionization and dissociation in hydrogen plasmas including fluctuations and magnetic fields Thermodynamics of ionization and dissociation in hydrogen plasmas including fluctuations and magnetic fields

2002-12-03

arxiv.org/abs/astro-ph/0212060v1

Eur.Phys.J. D23 (2003) 265-272

Astronomy and Astrophysics

Astrophysics

8 pages, 10 figures, submitted to Eur.Phys.D

Scientific paper

10.1140/epjd/e2003-00041-9

Applying Gibb's geometrical methods to the thermodynamics of H-plasmas we explore the landscape of the free energy as a function of the degrees of ionization and dissociation. Several approximations for the free energy are discussed. We show that in the region of partial ionization/dissociation the quantum Debye-Hueckel approximation (QDHA) yields a rather good but still simple representation which allows to include magnetic field and fluctuation effects. By using relations of Onsager-Landau-type the probability of fluctuations and ionization/dissociation processes are described. We show that the degrees of ionization/dissociation are probabilistic quantities which are subject to a relatively large dispersion. Magnetic field effects are studied.

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