Insertion of an electron beam ionizer in a quadrupole spectrometer for secondary neutral mass analysis O. Ameziane, J. M. Blanco, J. J. Serrano, B. Guzmán and M. Aguilar Eur. Phys. J. AP, 22 3 (2003) 231-235 Published online: 14 May 2003 DOI: 10.1051/epjap:2003032