Abstract
Excitation mechanism of the laser action on the first positive system (B3Πg-A3Σu+) of N2 molecule is studied with an emphasis on the time relationship between the ir and uv (C3Πu-B3Πg) laser pulses. Pressure dependence of time lag between the uv and ir pulses has been observed in the pressure range from 4 to 8 Torr using an axial-discharge tube. The observed time lag is well predicted by a model which involves direct electron-impact excitation, near-resonant collisional excitation transfer from the a1Πg state, and cascade excitation due to the uv laser action for the upper ir laser level. Relative importance of these excitation processes depends primarily on N2 pressure.
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