Off-axis motions and distortions in acceptor-H complexes from uniaxial stress studies

The stretching vibrations of H in the B-H and Al-H complexes in Si have been studied under uniaxial stress. For B-H we show that H can move between different <111> axes at elevated temperatures. For Al-H we observe stress induced sidebands that are related to the low frequency excitations that were thermally populated in a previous study of the temperature dependence of the spectrum. (author) 14 refs., 6 figs