Vibrational populations of N2(A 3Σu+) in a pure nitrogen glow discharge

摘要: The populations of the N2(A 3 Sigma u+, nu =0-5) states in a pure nitrogen glow discharge have been determined from measurements absorption first positive system bands for gas pressures range 0.1-2 Torr and current densities up to about 30 mA cm-2. observed vibrational distributions are highly non-Boltzmann an inversion population between levels =2 =3 was found. total =0-5 saturates with increasing current, saturated ranging 6*1012 cm-3, depending on pressure. An interpretation experimental data is given using kinetic model which includes excitation individual N2(A, ) by electron impact ground-state molecules cascading B Pi g A state, diffusion wall, quenching atoms, metastable-metastable energy pooling, vibration-vibration transfer N2(A) N2(X) molecules, collisionally induced transitions u+ states. predictions good agreement measurements. However cannot be explained above mechanisms. It suggested that due vibrationally dependent quenching.