抄録
Cyclotron resonance study of thermally quenched germanium has been made. Various cyclotron resonance characteristics indicate that the introduced thermal acceptors are not due to the diffused-in copper which is likely to enter during the high temperature treatment. On the implicit as-sumption that the acceptor is an isolated vacancy, its electron scattering mechanism is discussed. Simple treatments of the scattering by an elastic strain or a three-dimensional square well potential around a vacancy do not explain the resonance behavior well, while the observed magnitude of the scattering cross section and its temperature dependence have a strong resemblance to those for other acceptor impurities such as indium, gallium or zinc. Especially the similarity to zinc is indeed surprising. Such resemblance might suggest a picture that electrons trapped in a certain way at the dangling bonds around a vacancy corresponds to the core of an impurity acceptor.
