波谱学杂志 ›› 1991, Vol. 8 ›› Issue (1): 123-130.

• 研究论文 • 上一篇    下一篇

一种精密的边限振荡器型NQR谱仪及其应用

房德慧1, 刘德海1, 郑小利1, 张彼得2   

  1. 1. 国家教委教学仪器研究所;
    2. 北京师范大学现代化教育技术研究所
  • 收稿日期:1990-03-20 修回日期:1990-09-06 出版日期:1991-03-05 发布日期:2018-01-20
  • 基金资助:
    A part of the project supported by National Natural Science Foundation of China

A PRECISION MARGINAL OSCILLATOR-TYPE NQR SPECTROMETER AND IT'S APPLICATION

Fang Dehui1, Liu Dehai1, Zheng Xiaoli1, Zhang Bide2   

  1. 1. Res. Inst. of Teaching Instrument, State Education Commission, Beijing 100083;
    2. Res. Inst. of Modem Educational Technique, Beijing Normal University
  • Received:1990-03-20 Revised:1990-09-06 Online:1991-03-05 Published:2018-01-20
  • Supported by:
    A part of the project supported by National Natural Science Foundation of China

摘要: 本文介绍一种精密的场效应管边限振荡器型核四极矩共振(NQR)谱仪。工作频率范围14MHz~35MHz,分段连续可调。这种谱仪的灵敏度高、波形失真小。在室温下,多晶粉未状氯酸钾样品中35Cl的NQR频率测量精度大约3×10-6。重结晶样品中35Cl的NQR谱一次微分信号信噪比S/N ≥ 150。用该谱仪对KClO3、NaClO3、NaCl样品进行测试,得到氯的同位素35Cl和37Cl的四极耦合常数比(eQq35Cl/(eQq37Cl的实测值分别为1.2687363、1.2687306、1.2687361。在77K到393K温度区间测量了氯酸钾多晶粉未状样品中35Cl的NQR共振频率和温度的关系,在冰水混合温度附近,温度每变化0.1K,NQR频率的变化是478Hz。

关键词: NOR谱仪, 边限振荡器, 探头, 灵敏度, 固态

Abstract: A precision marginal oscillator-type nuclear quadrupole resonance (NQR) spectrometer using field effect transistors (JFET'S) is described in this paper. The frequency is succesivcly adjustable by several ranges from 14 MHz to 35 MHz, This spectrometer shows a high sensitivity and small wave shape distortion. At room temperature, the measuring accuracy of NQR frequency of 35Cl in polycrystallinc powder of potassium chlorate sample is about 3×10-6, the signal to noise ratio (S/N) of NQR spectrum of 35Cl in recrystallized sample is greater Than 150. The obtained chlorine's quadrupolc coupling ratio (eQq) 35Cl/(eQq) 37Cl in potassium chlorate, sodium chlorate and sodium chloride art 1.2687363, 1.2687306 and 1.2687661 respectively. The relation of nuclear quadrupole resonance frequency and temperature have been studied by 35Cl in polycrystalline powder sample when the temperature was varied from 77 K to 393 K.

Key words: NQR, Spectrometer, Marginal oscillator,Probe, Sensitivity, Solid state