K-band high-pressure cell for ENDOR studies

Area of Science:

• Solid State Physics
• Spectroscopy
• Materials Science

Background:

• F-centers are point defects in ionic crystals with unique optical and magnetic properties.
• Understanding pressure-induced changes in F-center interactions is crucial for materials science.
• Existing high-pressure techniques for spectroscopic studies are often limited in versatility.

Purpose of the Study:

• To develop and characterize a versatile high-pressure K-band Electron Paramagnetic Resonance-Electron Nuclear Double Resonance (EPR-ENDOR) system.
• To enable the examination of hydrostatic pressure effects on F-center hyperfine interactions.
• To provide a robust platform for spectroscopic studies under extreme conditions.

Main Methods:

• A novel high-pressure K-band EPR-ENDOR system utilizing dielectric filling to minimize cell dimensions.
• A rotatable microwave joint integrated with the pressure seal for variable microwave coupling.
• A beryllium-copper high-pressure vessel tested to 18 kilobars, separated from the pressure generation device.
• Flexible system configuration for high-frequency field modulation EPR or ENDOR by magnetic field rotation.

Main Results:

• The developed system demonstrates versatility for both EPR and ENDOR measurements under high pressure.
• Successful operation and testing of the system up to 18 kilobars.
• The design allows for precise control over experimental parameters like microwave coupling and magnetic field orientation.
• The system effectively minimizes inner dimensions of the pressure cell through dielectric filling.

Conclusions:

• The versatile high-pressure K-band EPR-ENDOR system is a valuable tool for studying pressure-dependent phenomena in F-centers.
• The design facilitates detailed investigations into hydrostatic pressure effects on hyperfine interactions.
• This system opens new avenues for spectroscopic research on materials under high pressure.