Synchrotron Mössbauer source: trade-off between intensity and linewidth.
Sergey Yaroslavtsev1, Aleksandr I Chumakov1
1ESRF - The European Synchrotron, CS40220, 38043 Grenoble Cedex 9, France.
Journal of Synchrotron Radiation
|November 8, 2022
Summary
This study optimizes the synchrotron Mössbauer source (SMS) by tuning an iron borate crystal. Researchers found optimal settings for high intensity and narrow linewidth, crucial for advanced materials analysis.
Area of Science:
- Materials Science
- Nuclear Physics
- Spectroscopy
Background:
- Synchrotron Mössbauer source (SMS) enables Mössbauer spectroscopy at synchrotrons.
- SMS offers micro-scale beams for analyzing minute samples, surpassing radioactive sources.
- SMS performance depends on the angular position and temperature of its 57FeBO3 crystal.
Purpose of the Study:
- To optimize Synchrotron Mössbauer Source (SMS) performance.
- Determine optimal angular position and temperature of the 57FeBO3 crystal for specific source widths and intensities.
- Analyze the trade-off between SMS intensity and linewidth.
Main Methods:
- Investigated angular and temperature dependencies of SMS parameters.
- Measured SMS intensity and linewidth across various crystal settings.
- Derived the instrumental function of the SMS under different operational conditions.
Main Results:
- Optimized SMS intensity can exceed 105 γ-quanta s-1 with a broadened linewidth (∼6 natural widths).
- Narrow linewidths (approaching natural width) result in intensities around 103 γ-quanta s-1.
- Intensity changes of two orders of magnitude occur within a narrow 0.5°C temperature range.
Conclusions:
- Optimal SMS performance is achievable by precisely controlling crystal angle and temperature.
- The study provides a framework for tuning SMS for specific experimental needs, balancing intensity and resolution.
- Understanding crystal properties like temperature instability and mosaicity is vital for consistent SMS performance.
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