An x-band continuous wave saturation recovery electron paramagnetic resonance spectrometer based on an arbitrary...

Area of Science:

• * Electron Paramagnetic Resonance (EPR) Spectroscopy
• * Materials Science and Condensed Matter Physics

Background:

• * Electron spin-lattice relaxation (T1) is a critical parameter for understanding material properties.
• * Conventional spectrometers for T1 measurements often involve complex hardware and limited stability.

Purpose of the Study:

• * To design and implement a novel X-band continuous wave saturation recovery spectrometer.
• * To leverage an arbitrary waveform generator (AWG) for simplified hardware and enhanced control.
• * To measure electron spin-lattice relaxation times (T1) with improved stability and reproducibility.

Main Methods:

• * Designed an X-band (9-10 GHz) spectrometer centered around an arbitrary waveform generator (AWG).
• * Utilized the AWG as the microwave source for pulse timing, control signals, and digitizer triggering.
• * Incorporated selectable power amplification paths, dual balanced mixers, and a high-stability clock to reduce source noise.

Main Results:

• * The AWG-based spectrometer demonstrated simplified hardware and a reduced footprint compared to conventional designs.
• * Achieved excellent signal-to-noise ratios for samples with 1 × 10^15 to 8 × 10^17 spins and T1 values from hundreds of ns to hundreds of μs.
• * Observed superior stability and data reproducibility over conventional sources, with acquisition times of 2-90 s.

Conclusions:

• * The arbitrary waveform generator-based spectrometer offers a simplified and more stable platform for electron spin-lattice relaxation measurements.
• * The system exhibits performance comparable to conventional spectrometers but with enhanced stability and reproducibility.
• * The spectrometer's design is adaptable for measurements across the AWG's frequency range with component modification.