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High-field, multifrequency EPR spectroscopy using whispering gallery dielectric resonators
G Annino1, M Cassettari, M Fittipaldi
1Istituto di Fisica Atomica e Molecolare del CNR, Via del Giardino 7, Pisa, 56127, Italy.
Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|March 4, 2000
Summary
High-field Electron Paramagnetic Resonance (EPR) spectroscopy was advanced using novel laser and dielectric resonator technology. This method enables multifrequency EPR measurements, enhancing sensitivity for future THz-range studies.
Area of Science:
- Physics
- Spectroscopy
- Chemistry
Background:
- Electron Paramagnetic Resonance (EPR) spectroscopy is a powerful technique for studying materials with unpaired electrons.
- High-field and high-frequency EPR offer increased spectral resolution and sensitivity.
- Existing high-frequency EPR systems can be complex and expensive.
Purpose of the Study:
- To demonstrate a novel apparatus for high-field/high-frequency EPR spectroscopy.
- To explore the capabilities of multifrequency EPR measurements.
- To assess the potential for enhanced sensitivity in EPR spectroscopy up to the Terahertz (THz) regime.
Main Methods:
- Performed EPR spectroscopy experiments at 240-GHz and 316-GHz frequencies.
- Utilized a novel apparatus combining far infrared molecular lasers.
- Employed a probehead exploiting dielectric resonators operating in whispering gallery modes.
Main Results:
- Successfully conducted high-field/high-frequency EPR measurements.
- Demonstrated a relatively simple method for multifrequency EPR spectroscopy.
- The developed apparatus shows promise for high-sensitivity EPR applications.
Conclusions:
- The novel combination of lasers and dielectric resonators provides an effective approach for multifrequency EPR.
- This technique opens new avenues for high-sensitivity EPR spectroscopy, particularly in the THz frequency range.