Abstract
Nitrogen–helium mixture plasma is investigated via optical emission spectroscopy and the effect of helium mixing on the excitation temperature, vibrational temperature of the second positive system and first negative system of nitrogen plasma is monitored. The excitation temperature is calculated from He–I lines by using Boltzmann's plot method, which increases with an increase in helium percentage in the mixture. On the other hand, it is noted that the vibrational temperature of the second positive system increases with an increase in helium percentage but it decreases for the selected first negative system of nitrogen. It is also observed that vibrational temperature increases with an increase in filling gas pressure. To confirm whether the selected vibrational bands follow Boltzmann's distribution, a linearization process is employed. The vibrational temperature of the ground state of nitrogen is calculated from on the basis of inverse Franck–Condon factors.
Published Version
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