Positron Studies of Lattice Defects in Metals

摘要: The conscious study of lattice defects with positrons is now some ten years old. Although sharing the techniques and guided by results longer established studies described in Chap.2, defect are based on a somewhat different philosophy. Electronic structure rely for their credence belief that, sufficiently well-annealed single-crystal samples, annihilate from common, well-defined, delocalised state which they can freely sample nonlocal properties medium. perturbing effect positron charge electronic system general an unwelcome complication. In the-situation radically different. Here charged positron’s interactions surrounding medium play vital role providing possibility variety additional localised states at structural defects. investigation defect-induced changes commonly measured characteristics annihilation (Chap.l) interpretat such terms things as concentration, nature, origins responsible essential ingredients our study.