Probabilities of rotational transitions under ionization into N2+ (B 2Σu+, vʹ = 0) state by electron impact Original Research Article

The results of measurement of the rotational transition probability matrix for ionization-excitation of N2(X 1Σg+) into the N2+ (B 2Σg+) state by a high energy electron beam are presented. Experimental data are obtained in pure nitrogen and argon-nitrogen free jets at low temperatures under equilibrium conditions. The matrix is represented in a compact form corresponding to the infinite order sudden approximation with the transition probabilities from the ground rotational state of N2(X 1Σg+, N = 0) into the excited N2+ (B 2Σg+, N− = 1, 3, 5, 7) state equal to P10 = 0.8251, P30 = 0.1494, P50 = 0.0196, P70 = 0.0045. The results obtained are compared with the results of measuring populations of rotational nitrogen levels by LIF, CARS and Raman spectroscopy methods. An excellent agreement has been found which confirms the validity of obtained probabilities.