The 57Fe Synchrotron Mössbauer Source at the ESRF.

Area of Science:

• Nuclear Physics
• Materials Science
• Spectroscopy

Background:

• Mössbauer spectroscopy traditionally uses radioactive sources, limiting brilliance and resolution.
• Synchrotron radiation offers a powerful alternative for nuclear resonant applications.

Purpose of the Study:

• To design and describe a (57)Fe Synchrotron Mössbauer Source (SMS) for enhanced energy-domain Mössbauer spectroscopy.
• To leverage synchrotron radiation for high-brilliance, polarized, and tunable resonant gamma-ray beams.

Main Methods:

• Utilizing a nuclear resonant monochromator with pure nuclear reflections from an iron borate ((57)FeBO(3)) crystal.
• Implementing collimation of incident synchrotron radiation for optimal crystal illumination and energy resolution.

Main Results:

• The SMS provides tunable (57)Fe resonant radiation (14.4 keV) with a narrow bandwidth (15 neV).
• Achieved a focused beam spot size of 10 µm × 5 µm with high brilliance and polarization.
• Demonstrated a significant reduction in data acquisition time, e.g., ~10 min for a high-pressure spectrum vs. >1 week.

Conclusions:

• The developed SMS is a powerful tool for studying small samples under extreme conditions (high pressure, high temperature, ultrahigh vacuum).
• Its high intensity, small spot size, and rapid data collection capabilities revolutionize Mössbauer spectroscopy experiments.
• The SMS is compatible with existing experimental setups and operates without gating, enhancing its versatility.