International Conference on the Physics of Multiply Charged Ions and International Workshop on E.C.R. Ion Sources
J. Phys. Colloques 50 (1989) C1-189-C1-192
DOI: 10.1051/jphyscol:1989122
SATURATION EFFECTS IN THE IONISATION OF He BY H+ AND He2+ IMPACT AT INTERMEDIATE ENERGIES
G. C. BERNARDI1, 2, P. D. FAINSTEIN1, 3, C. R. GARIBOTTI1, 2 and S. SUAREZ1, 21 Centro Atomico Bariloche, RA-8400 Bariloche, Argentina
2 Consejo Nacional de Investigaciones Cientificas y Tecnicas.
3 Laboratoire des Collisions Atomiques, Université de Bordeaux I, 351 Cours de la Libération, F-33405 Talence, France
Abstract
Projectile charge dependence of double differential ionisation cross section for H+ and H2+3 on He is studied both theoretically and experimentally. The experimental ratio R of the emission induced by 50 and 100 keV/u H2+3 and H+ is compared with calculations from the CDW-EIS model. We report two main effects : a) a decrease of R with increasing angle of electronic emission, b) a sudden enhancement of R in the high energy side of the ECC peak.