On the Influence of the Ionization-Recombination Processes on Hydrogen Plasma Polytropic Index. (arXiv:2008.03565v2 [astro-ph.SR] UPDATED)
<a href="http://arxiv.org/find/astro-ph/1/au:+Mishonov_T/0/1/0/all/0/1">Todor M. Mishonov</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Dimitrova_I/0/1/0/all/0/1">Iglika M. Dimitrova</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Varonov_A/0/1/0/all/0/1">Albert M. Varonov</a>

The polytropic (adiabatic) index for pure hydrogen plasma is analytically
calculated as function of reciprocal temperature and degree of ionization.
Additionally, the polytropic index is graphically represented as a function of
temperature and density. It is concluded that the partially ionized hydrogen
plasma cannot be exactly polytropic. The calculated deviations from the
mono-atomic value 5/3 are measurable. The analytical result for pure hydrogen
plasma is a test example how this approach can be extended for arbitrary gas
cocktail.

The polytropic (adiabatic) index for pure hydrogen plasma is analytically
calculated as function of reciprocal temperature and degree of ionization.
Additionally, the polytropic index is graphically represented as a function of
temperature and density. It is concluded that the partially ionized hydrogen
plasma cannot be exactly polytropic. The calculated deviations from the
mono-atomic value 5/3 are measurable. The analytical result for pure hydrogen
plasma is a test example how this approach can be extended for arbitrary gas
cocktail.

http://arxiv.org/icons/sfx.gif