Power Dependence of the Pink Afterglow in Flowing Postdischarge in Pure Nitrogen

The nitrogen short-lived postdischarge, also known as nitrogen pink afterglow, was studied in the flowing regime as a function of the applied power. The maximal emission intensity of this afterglow shifts to shorter times proportionally to the applied power. The images demonstrate that the pink afterglow creation is due to kinetic processes in volume, although heterogeneous surface reactions may contribute significantly to the overall kinetics.