Dechannelling of fast ions in distorted crystals, 1

The dechannelling of fast ions by lattice distortion in crystals is studied by a simple modification of the continuum model of channelling. The results show that the dechannelling cross section by a dislocation is proportional to the square root of the ion energy. The dechannelling probability of He+ and H+ ions near dislocations in several crystals are calculated. The calculated results are compared with the observed dechannelling rates of He+ ions in irradiated KBr crystals and those of He+ ions in irradiated Au crystals. (auth.)