Abstract
Energy and angular distributions of negative ions (, , , and ) emitted from gold target bombarded by Au, , and projectiles at were measured with a multipixel position sensitive detector. The angular distributions are symmetrical with respect to the normal to the target surface and forward peaked. They depend on the type of emitted ions, on the emission energy, and on the projectile size. More forward directed emission is observed with projectiles. The secondary ion energy distributions obtained with Au and projectiles are well reproduced by a sum of linear collision cascades and thermal spike processes. However, in the case of projectiles the energy distributions are better described by using a simple spike model with two different average temperature regimes: the first one corresponds to high emission energy occurring in the early stage of the whole process, and the second to the low energy component.
11 More- Received 18 October 2004
DOI:https://doi.org/10.1103/PhysRevB.71.174110
©2005 American Physical Society