Dechanneling by dislocations: A time-dependent approach

The motion of positrons in the planar channel surrounded by two atomic plan es gives rise to descrete energy levels in the transverse potential. The tr ansitions from these bound states to scattering states due to lattice disto rtions in the planar channel are described using a time-dependent centrifug al-energy term. The resulting expressions for dechanneling probabilities an d hence for the dechanneling cross section for initially well channeled par ticles has been estimated, and qualitative features like dechanneling radiu s, energy dependence, etc., are discussed. [S0163-1829(99)04113-2].