MOLECULAR BEAM SAMPLING OF METASTABLE ATOMS FROM A HOLLOW CATHODE ARC AS A PROBE FOR THE ELECTRON TEMPERATURE P.G.A. Theuws, H.C.W. Beijerinck, C.E.E. Pernot, D.C. Schram and N.F. Verster. J. Phys. Colloques, 40 C7 (1979) C7-141-C7-142 DOI: 10.1051/jphyscol:1979769