Abstract
The GRID (Gamma Ray Induced Doppler broadening) spectroscopy has been tested for the first time to investigate the lattice position of Er in yttrium-aluminium-perovskite (YAP). The measured energy distributions of the Doppler-broadened secondary γ-line are clearly different for the two crystalline directions investigated. The best fit of the experimental data is obtained for Er on the Y-site, a life-time of the γ-emitting intermediate level of 32 fs and population of this level from an additional intermediate level (side-feeding). The experimental results confirm the theoretically predicted directional dependence of the Doppler broadening as well as the opportunity to use the method to determine positions of selected foreign atoms in single crystals.
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