LAUSR

We observed green optical emission from an atmospheric‐pressure N2/O2 plasma jet. The green optical emission was composed of a line emission at λ = 557.71 ± 0.03 nm and a broadband component at 530 ≤ λ ≤ 560 nm. The line emission was assigned to the 1D−1S forbidden transition of atomic oxygen, whereas the broadband emission was due to the formation of O(1S)N2 excimer. We measured the absolute densities of O(1S) and O(1S)N2 using a spectrograph with the absolute sensitivity calibration, and we discussed the kinetics in the green plasma jet on the basis of the absolute O(1S) and O(1S)N2 densities. According to the rate coefficients and the transition probabilities reported in literature, the present experimental results are explained if the densities of N2(A3∑u+) and O(3P) are 9 × 1013 and 3 × 1013cm−3, respectively.