Molecular ion emission from single large cluster impacts
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We investigated the emission of the secondary ions stimulated by single impacts of 136 keV Au 4004+ projectiles. The study was carried out on targets of glycine, phenylalanine, and C 60 . In addition, a target of C 60 was examined with 18 keV C 60+ projectiles. The experiments were performed in the event-by-event bombardment/detection mode. The secondary ions were identified with linear time-of-flight mass spectrometer equipped with an 8-anode detector. The Au 4004+ projectile induces abundant multi-ion emission, for instance the average number of detected ions (atomic, fragment, molecular and cluster ions) emitted per event from glycine target is 12.5. The glycine intact molecular ion (Gly - ) yield is 1.14. The bombardment of a C 60 target results in the efficient emission of multiple intact C 60- (total yield is 0.15). 2006 Elsevier B.V. All rights reserved.