A Phenomenological Model for Positron Trapping at Dislocations

Abstract：

A multi-state trapping model involving positron trapping at dislocations and jogs is proposed, in which effect of positron detrapping can be omitted. According to this mcxJel the dislocations with variant jog density have different functions in positron annihilation process. The case that dislocation trapping is predominant and the open-space ratio between dislocation core and singlevacancy is emphatically discussed. Using the data in some literatures, we have estimated the positron annihilated rate at dislocations and the jog interval on the dislocation line. The results obtained seem reasonable.