Fast ion surface energy loss and straggling in the surface wake fields
1Inter-University Accelerator Centre, JNU New Campus, New Delhi 110067, India. nanditapan@gmail.com
Physical Review Letters
|July 4, 2013
Summary
Energy loss and straggling of fast ions in bilayer targets depend on layer order. This novel finding suggests a surface energy loss field effect, confirmed across various experimental conditions.
Area of Science:
- Atomic and Molecular Physics
- Materials Science
- Condensed Matter Physics
Background:
- Understanding ion-matter interactions is crucial for materials modification and analysis.
- Previous studies on ion stopping powers have primarily focused on homogeneous materials.
Purpose of the Study:
- To investigate the stopping powers and straggling of fast, highly ionized atoms in bilayer targets.
- To explore the influence of target layer ordering on ion energy loss and straggling.
Main Methods:
- Experimental measurement of energy loss and straggling for fast, highly ionized atoms.
- Utilized thin bilayer targets composed of metals and insulators.
- Varied projectile types, velocities, and target configurations, including diatomic molecular ions.
Main Results:
- Observed a significant dependence of energy loss and straggling on the ordering of metal-insulator bilayer targets.
- Demonstrated that reversing the bilayer order resulted in distinct energy loss and straggling values.
- Confirmed these findings across multiple projectile-velocity-target combinations.
Conclusions:
- The observed asymmetry in energy loss is attributed to a surface energy loss field effect, influenced by differing surface wake fields upon ion exit.
- Experimental results support theoretical predictions of surface wake potentials for ions in solids.
- The study provides evidence for the existence of a self-wake phenomenon in ion-solid interactions.
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