Highly sensitive M'ossbauer spectrometer for investigations of dynamic processes

The performance, operation and functional capabilities of the spectrometer are described. The spectrometer is intended for Mössbauer investigations of dynamic processes in condensed media containing resonance isotope nuclei (Selective Excitation Double Mössbauer Effect, SEDM) or not (Rayleigh Scattering of Mössbauer Radiation, RSMR). The results of investigations on the optimization of gamma optics of the spectrometer as illustrated by experiments on selective excitation are presented. The variety of the gamma optics depends on the characteristics of detectors employed for registration of scattered radiation. It is shown that introduction of resonance detectors increases the sensitivity, accuracy and reduces the acquisition time by a factor of 10. The spectrometer is equipped with two Doppler modulation systems which can operate in both synchronous and asynchronous modes. The accuracy of adjustment to a required constant velocity value and of reproducibility is 0.04%. The spectrometer allows one to make a further step forward in the study of dynamic processes.