Energy dependence relations for positron channeling critical angle and dechanneling probability due to stacking faults

Abstract

Energy dependence studies of channeling critical angle and dechanneling probabilities are essential for defect analysis. Present study reveals the fact that the well known energy dependence relations are not always applicable, particularly for the case of light relativistic particles. Here the energy dependence for positron channeling angular scans and dechanneling probability due to stacking faults is obtained using quantum mechanical models. The channeling critical angle calculated using this method (∼1.1° for 1 MeV e+ in Au along (1 1 1) planes) is consistent with the experimental value measured by Andresen et al. [Phys. Rev. B 3 (1971) 705]. New energy dependence relations derived in this study are found to be consistent with standard formulae as and when the system enters into classical regime. © 2010 Elsevier B.V. All rights reserved.