HIGHLY SENSITIVE MOSSBAUER SPECTROMETER FOR SEDM AND RSMR INVESTIGATIONS

The performance, operation and functional capabilities of the spectrom eter are described. The spectrometer is intended for Mossbauer investi gations of dynamic processes in condensed media containing resonance i sotope nuclei (selective excitation double Mossbauer effect, SEDM) or not (Rayleigh scattering of Mossbauer radiation, RSMR). The results of investigations on the optimization of gamma-optics of the spectromete r as illustrated by experiments on selective excitation are presented. The variety of these gamma-optics depends on the characteristics of t he detectors employed for registration of scattered radiation. It is s hown that introduction of resonance detectors increases the sensitivit y, accuracy and reduces acquisition time by a factor of 10. The spectr ometer is equipped with two Doppler modulation systems which can opera te in both synchronous and asynchronous modes. The accuracy of adjustm ent 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.