Equation of State of Partially-Ionized Plasmas in the Physical Picture

Details Equation of State of Partially-Ionized Plasmas in the Physical Picture Equation of State of Partially-Ionized Plasmas in the Physical Picture

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992rmxaa..23..133r&link_type=abstract

Revista Mexicana de Astronomia y Astrofisica, 23, 133

Astronomy and Astrophysics

Astronomy

2

Scientific paper

RESUMEN. La ecuaci6n de estado que utiliza el programa de opacidades OPAL, se basa en una expansi6n de actividad de muchos cuerpos de la funci6n de partici6n gran can6nica. Se presenta una descripci6n general del metodo. Este enfoqiie toma en cuenta, desde el principio, la interacci6n cul6mbica basica entre los electrones y los niideos en el sistema. A consecuencia, no existe la necesidad de factorizar la energfa libre, hacer afirmaciones sobre el efecto del medio ambiente del plasma sobre los estados ligados 0 introducir algiin mecanismo para truncar Ia funci6n de partici6n interna; tal como ocurre en los metodos donde se minimiza la energfa libre. ABSTRACT. The equation of state used by the OPAL opacity code is based on a many-body activity expansion of the grand canonical partition function. Herein we give an overview of the method. This approach considers, from the outset, the basic Coulomb interaction between the electrons and nuclei in the system. Consequently, there is no need to factorize the free energy, make assertions about the effect of the plasma environment on bound states, or invoke a mechanism for truncating the internal partition function; as in free energy minimization methods. Key words: EQUATION OF STATE - PLASMAS

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