Dechanneling by dislocations: A time-dependent approach

The motion of positrons in the planar channel surrounded by two atomic planes gives rise to descrete energy levels in the transverse potential. The transitions from these bound states to scattering states due to lattice distortions in the planar channel are described using a time-dependent centrifugal-energy term. The resulting expressions for dechanneling probabilities and hence for the dechanneling cross section for initially well channeled particles has been estimated, and qualitative features like dechanneling radius, energy dependence, etc., are discussed. [S0163-1829(99)04113-2].