Mössbauer isomer shift measurements without mechanical tuning

Abstract

A technique is described which demonstrates how a frequency modulation spectrometer (FMS) can be used to measure the isomer shift of ferromagnetic absorbers without mechanical tuning. As an example, the isomer shift of an iron sample relative to a 57CO source in a Pd matrix was measured and found to be -(0.1869 ± 0.003) mm/s compared to the literature value of -(0.185 ± 0.02) mm/s.