✍ Scribed by A. Habib
No coin nor oath required. For personal study only.
A collisional-radiative model (CRM) is developed to study nitrogen arc plasma. The model is based on solution of the rate equations of n species chosen for the study. The species chosen are: electrons e, atomic ions N + , atoms N, diatomic molecules N 2 , and molecular ions N þ 2 , we have then n ¼ 5 species. The CRM is applied to homogeneous and quasi-stationary state (HQSS) plasma for electron temperature T e upto 12 000 K. All heavy particles are assumed to have the same kinetic temperature T g such that T g ¼ T e , this means the temperature of the all five species is identical and is called plasma temperature T. The total pressure of the plasma is considered between 1 and 4 atm. The plasma composition is calculated taking into account all significant collisional and radiative mechanisms. The local effect of radiation absorption is described by the optical escape factors L j and L jk for free-bound and bound-bound transitions. Results show significant deviation from local thermodynamic equilibrium (LTE). It was also shown that the plasma pressure p has a strong influence on deviation from LTE. To assess the relative speeds of recombination reactions in nitrogen arc plasma we have calculated the relaxation time t (or time constant) as a function of temperature.
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