调频调场式顺磁共振仪基本性能的实验探讨及提高

本工作对三厘米波段调频调场式顺磁共振仪的基本性能进行了系统的实验性探讨。确定了影响灵敏度、稳定性及分辨率的主要因素,并提出相应的改进方法,使仪器的基本性能得到显著提高。灵敏度达到相当于2.7×10^-12M固体DPPH的水平(RC=2秒,入腔功率10毫瓦)。基线一般能稳定在噪音电平范围内;谱线的重复性良好。仪器的分辨率优于1×10^-4。此外,也指出了这类方案目前存在着的主要缺点。

EXPERIMENTAL INVESTIGATION AND IMPROVEMENT ON THE FUNDAMENTAL CHARACTERS OF ESR SPECTROMETER WITH FREQUENCY AND MAGNETIC FIELD MODULATION

After systematic experimental investigations, the chief factors which influence the sensitivity, stability and resolution of the ESR spectrometer have been ascertained. Effective means of improving these characters have been worked out. As a result, the sensitivity has reached 2.7×10^-12M DPPH. (RC = 2sec., microwave power into cavity ≈l0mw.). The resolution has been found to be better than 1×10^-4. The baseline stability has been greatly increased. The main drawbacks inherent in this type of spectrometer has also been discussed.