Excitation Transfer Process in Penning Ionization of the CO Molecule by Helium Atoms in Singlet Metastable State B. Lescop, M. Ben Arfa, G. Le Coz, M. Cherid, G. Sinou, G. Fanjoux, A. Le Nadan et F. Tuffin J. Phys. II France, 7 11 (1997) 1543-1554 DOI: 10.1051/jp2:1997202