Collisional-Radiative modeling of plasma UV-VIS emission spectra

Numerical collisional-radiative (CR) models can theoretically derive the temperature and excited state population densities of interstellar and experimental plasmas. Non-invasive photoemission spectroscopy is an invaluable diagnostic technique to verify CR model predictions. $He, Ar,$ and $N_{2}$ plasmas are created in vacuum tube, and emission is collected from 5mtorr to 20torr gas pressures. Effects of pressure on spectrum and population densities will be shown. We will discuss the CR modeling of various conditions and compare these simulations to the collected spectra.