An X-Band Crossed-Loop EPR Resonator.

Area of Science:

• Physics
• Chemistry
• Materials Science

Background:

• Electron Paramagnetic Resonance (EPR) spectroscopy is a powerful technique for studying materials with unpaired electrons.
• High-quality resonators are essential for sensitive EPR measurements.
• Existing resonators may have limitations in efficiency or sample compatibility.

Purpose of the Study:

• To construct and characterize a novel copper X-band cross loop resonator.
• To evaluate the resonator's performance for Electron Paramagnetic Resonance (EPR) spectroscopy.
• To demonstrate its utility in measuring spin-lattice relaxation times (T1).

Main Methods:

• Fabrication of a copper X-band (9.22 GHz) cross loop resonator.
• Characterization of resonator quality factor (Q) and efficiency.
• Measurement of spin-lattice relaxation times (T1) using the saturation recovery method.

Main Results:

• The constructed resonator operates at X-band (9.22 GHz) and is compatible with 4 mm sample tubes.
• Resonator quality factors (Q) of 380 and 350 were achieved.
• Resonator efficiency was determined to be approximately 1 G/sqrt(W).

Conclusions:

• The developed copper X-band cross loop resonator is suitable for EPR applications.
• The resonator demonstrates effective performance for measuring T1 relaxation times.
• Successful measurements were performed on coal and an immobilized nitroxide radical.