THE ROLE OF SINGLE-STEP IONIZATION BY THERMAL ELECTRON-ATOM COLLISIONS G.V. Golubkov, N.M. Kuznetsov and V.V. Yegorov. J. Phys. Colloques, 40 C7 (1979) C7-89-C7-90 DOI: 10.1051/jphyscol:1979744