EFFECT OF THE PREEQUILIBRIUM CHARGE-STATE ON THE LI+ EMISSION YIELD

The secondary emission yield of Li+ from a LIF target bombarded with 2 .0 MeV nitrogen ions was measured as functions of the incident ion cha rge state and of the target temperature, The results were discussed co nsidering current models (Bitensky et al., Nucl. Instr. and Meth. B 72 (1992) 380; da Silveira and Mates, Surf Sci. 326 (1995) 370) and the effects of the contaminant layer adsorbed on the target surface, It wa s found that the Li+ emission yield shows a dependence on the ion pre- equilibrium charge state in contrast with the H+ emission yield, which is known to be strongly dependent on the incident charge state of the projectile. (C) 1998 Elsevier Science B.V.