High negative ion production yield in 30 keV F 2+ + adenine (C 5H 5N 5) collisions

Abstract

In collisions between slow F 2+ ions (30 keV) and molecular targets, adenine, scattered particle production yields have been measured directly by simultaneous detection of neutrals, positive and negative ions. The relative cross-section for a negative ion formation channel was measured to be 1%. Despite a slight decrease compared to a larger target, the fullerene C 60, the measured negative ion formation cross section is still at least one order of magnitude larger than the yield in ion-atom interactions. © 2009 IOP Publishing Ltd.