WANG Li;

• 1:Physics College
• 2:Donghua University

Abstract：

Electron paramagnetic resonance(EPR) is a powerful technique for probing the spin states of unpaired electrons and for elucidating the structure and energy-transfer pathways of matter. By retrofitting the teaching-grade Dahua EPR spectrometer with a modulation field and a lock-in amplifier, we obtain the first-derivative absorption signal and employ the NI Lab VIEW platform to automate signal control and data acquisition. Using the standard DPPH sample, the relaxation time and Lander factor are determined. Through this experiment, students gain an intuitive appreciation of how modulation fields and lock-in amplifiers are used to handle weak signals in magnetic-resonance investigations, thereby enhancing their overall experimental proficiency.

Key Words： electron paramagnetic resonance;lock-in amplifier;modulated magnetic field;Lander factor;relaxation time

Abstract:

Keywords:

Foundation: 东华大学物理学院教改项目

Authors: WANG Li;

References：

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