Application of collisional radiative models for atomic and molecular hydrogen to a negative ion source for fusion

Population models describe the dependence of the population densities of the excited molecular or atomic states in a plasma on various plasma parameters, like the electron density and temperature. The simplest population model is called corona model, balancing only the electron collision excitation from the ground state with the spontaneous emission. This model is valid for plasmas with low electron density (less then 1012 m