电子自旋共振实验中自旋弛豫时间的测定

摘要

介绍了电子自旋共振实验的基本原理和实验方法。利用实验教学仪器，首次测量了DPPH样品中未成对电子的自旋弛豫时间。实验中，利用RC移相电路消除了磁共振信号与扫场电压信号之间90°的相位差。在示波器的X‐Y显示模式下，得到了磁共振信号的准确波形。根据磁共振的理论公式，以及测得的共振信号的半高宽度，计算出了DPPH样品中的电子自旋弛豫时间。%The basic principle and experimental method of electron spin resonance have been introduced .By means of the instrument for experimental teaching ,the spin relaxation time of unpaired electrons in DPPH sample has been measured for the first time .In experiment ,a RC phase‐shifting electrocircuit was utilized to remove the 90° phase‐difference between magnetic resonant signal and field‐scanning voltage signal .Un‐der the X‐Y displaying mode of oscilloscope ,the accurate waveform of resonant signal was obtained .Ac‐cording to the theoretical formula of magnetic resonance ,as well as the measured width at half maximum of resonant signal ,the electron spin relaxation time in DPPH sample has been calculated .