High-efficiency energy-domain multiline gamma-ray quasi-elastic scattering spectroscopy using triple absorbers
摘要
Synchrotron-radiation-based quasi-elastic scattering using multiline Mössbauer radiation from a nuclear Bragg monochromator allows for dynamic studies on timescales ranging from sub-nanoseconds to several tens of nanoseconds, which have not been fully covered by X-ray-based techniques. However, the potential performance of this technique has not yet been fully explored. In this study, a new, high-efficiency energy analyser system composed of three Mössbauer absorbers was developed, enabling more efficient analysis of the quasi-elastic scattering. The absorption depth of the absorption-type, energy-domain, quasi-elastic scattering spectra increased two-fold with the introduction of the new analyser, indicating the high measurement efficiency of the new system. In addition, both experimental and simulation studies showed that the intermediate scattering function, which includes the dynamic information of the sample, can be accurately visualised via Fourier-transformation-based analysis of the experimental energy spectra. The new system and analytical methodology can be applied to various systems such as liquids, glasses, and soft-matter systems.