Influence of massive projectile size and energy on secondary ion yields from organic surfaces
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We investigated the influence of the projectile size and energy using Au nq+ clusters (5 < n < 400, 1 < q < 4) impacting on a glycine target with a 19q-34q keV energy range. We show that both CN - fragment and Gly - molecular ion yields are equivalent for projectiles with n > 9 and increase with the energy per projectile atoms. A maximum yield of 0.5 (50%) for both CN - and Gly - was obtained with the Au 4004+ projectile at 136 keV total energy. For Gly - , the yield enhancement is linear for Au n when n > 5. Trends for the CN - fragment are different. A nonlinear yield enhancement proportional to n 3 is observed for Au n when n < 9. © 2006 Elsevier B.V. All rights reserved.
author list (cited authors)
Guillermier, C., Della Negra, S., Rickman, R. D., Pinnick, V., & Schweikert, E. A.