Abstract
Doppler broadening method of positron annihilation (DOBPA method) is developed, and applied to the study of electronic structures of alkali halides. Radiation from positron annihilation in 14 kinds of alkali halide single crystals were measured with a Ge(Li) detector system. Observed Doppler broadened spectra were unfolded by computer, and intrinsic distributions were obtained. Electron momentum distributions were extracted from these distributions. To study anisotropy of the momentum distribution, radiation was measured along the [110] direction as well as along the [100] direction. Anisotropy of the momentum distribution was observed except for lithium halides and cesium halides. The strongest anisotropy was found in RbBr.
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