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Partition Functions and Thermodynamic Properties of Argon Plasma

Report Number: AEDC TDR 63-146
Author: Drellishak, K. S.
Author: Knopp, C. F.
Author: Cambel, Ali Bulent
Corporate Author: Northwestern University
Date of Publication: 1963-08
Pages: 238
Contract: AF 40(600)-748
Project: 8951
Task: 895104
AD Number: AD0414708

Using tabulated data for observed atomic energy levels plus estimated energies for levels which are predicted but not observed, the internal partition functions for the argon atom and the first four argon ions were calculated on an IBM 709 computer. The partition functions were terminated by application of the Debye cutoff criterion and a corresponding lowering of the ionization potential was included. Assuming a mixture of six perfect gases (electrons, argon atoms, and argon ions) the equilibrium composition, internal partition functions and thermodynamic properties were calculated and tabulated for five pressures (0.1, 0.5, 1.0, 2.0, and 5.0 atmospheres) at 100 K increments for a range of temperatures from 5000 to 35000 K. The tables and figures include internal partition functions, composition, density, entropy, internal energy, enthalpy, Gibbs and Helmholtz potentials, specific heats at constant pressure and volume, the effective gamma and equilibrium sound speed.

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