Abstract
We describe a collisional radiative model (CRE) of homogeneously expanded nickel plasmas in vacuum. The CRE model is coupled with two separate electron and ion temperature magneto-hydrodynamic equations. On the output, the model provides the temporal variation of the electron temperature, ion temperature, and average charge state. We demonstrate the effect of three-body recombination $$({\propto}N_{\rm e} T^{-9/2}_{\rm e})$$ on plasma parameters, as it changes the time dependence of electron temperature from $$t^{-2}$$ to $$t^{-1}$$ and exhibits a pronounced effect leading to a freezing feature in the average charge state. In addition, the effect of the three-body recombination on the warm up of ions and delaying the equilibration is addressed.
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