SPECTROSCOPIC STUDY OF THE IONIZATION DYNAMICS IN A CO2 LASER-PRODUCED PLASMA OF HELIUM J.C. Gauthier, J.P. Geindre et N. Grandjouan J. Phys. Colloques, 40 C7 (1979) C7-735-C7-736 DOI: 10.1051/jphyscol:19797355