A Study of Equations of State/Opacity of Ionized Gases. Volume I.
Abstract
Developments in the calculation of the opacity and equation of state of ionized gases are described. A principal result in the CAPO code, a highly modular computer program for the calculation of thermodynamic and optical properties. Owing to its modular structure CAPO can be easily modified to allow improvements in the description of the physics. CAPO is based on the ionic model of a plasma. The system is viewed as an assemblage of ions and free electrons and each species is considered separately in the determination of the material properties. Free-free, bound-free and bound-bound processes contribute to the opacity. The line absorption is calculated in terms of a cluster or band model. Pressure ionization is treated in a manner that allows a thermodynamically consistent evaluation of thermodynamic functions. Considerations of the effect of pressure ionization on the electronic partition function suggest a reasonable method for avoiding the difficulties associated with the termination of the summation over states at quantum numbers where the binding energy is about equal to the pressure lowering of the ionization potential. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1971
- Accession Number
- AD0722709
Entities
People
- Albert G. Petschek
- Donald E. Parks
- Howard D. Cohen