Abstract
The design, operation and performance of a selective excitation double Mössbauer (SEDM) spectrometer are described. An innovative drive-mounted conversion electron detector for scattered γ-ray energy analysis provides a three orders of magnitude improvement in counting efficiency over previous SEDM equipment. Simple digital circuitry together with Wissel Mössbauer velocity transducers and electronics supplies energy synchronization for indefinite collection times. Magnetic materials containing resonant Mössbauer nuclei (e.g., Fe57) can now be conveniently studied using SEDM, offering a unique insight into dynamic processes.
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