The influence of gas-kinetic evolution on plasma reactions

TL;DR

This paper explores how gas-kinetic evolution affects plasma reactions, revealing that particle distribution changes influence reaction rates and plasma behavior, which are often overlooked in simple chemical models.

Contribution

The authors introduce a kinetic model that accounts for distribution evolution and its feedback on plasma reactions, highlighting effects missed by traditional chemical kinetics.

Findings

Distribution drift causes temperature fluctuations.

Reaction rates are affected by kinetic evolution.

Impacts on process yields and efficiencies.

Abstract

Plasmas in which there is a threshold for a dominant reaction to take place (such as recombination or attachment) will have particle distributions that evolve as the reaction progresses. The form of the Boltzmann collision term in such a context will cause the distribution to drift from its initial form, and so cause for example temperature fluctuations in the plasma if the distribution is originally Maxwellian. This behaviour will impact on the relevant reaction rates in a feedback loop that is missing from simple chemical kinetic descriptions since the plasma cannot be considered to be isothermal, as is the case in the latter approach. In this article we present a simple kinetic model that captures these essential features, showing how cumulative differences in the instantaneous species levels can arise over the purely chemical kinetic description, with implications for process yields and efficiencies.