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首页> 外文期刊>Zeitschrift fur Naturforschung. A, A journal of physical sciences >Rapid Measurement of Nutation NQR Spectra in Powders Using an RF Pulse Train
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Rapid Measurement of Nutation NQR Spectra in Powders Using an RF Pulse Train

机译：使用射频脉冲序列快速测量粉末中的营养NQR光谱

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摘要

The method of two-dimensional nutation NQR spectroscopy, introduced by Harbison in 1989, has been successfully used for determining of the asymmetry parameter of the EFG tensor for spin-3/2 nuclei in both powdered and monocrystal samples in the absence of an external magnetic field. The inconvenience inherent in the method, however, is the long time required, because data acquisition must be repeated for various RF pulse lengths. We discuss a method to reduce the time of the nutation experiment by using a sequence of identical short RF pulses of length t_w and distance τ. It is shown that for an NQR frequency ω_0, frequency offset Δω, and pulse parameters satisfying the relation ω_0τ + Δω t_w = 2 π k (k = 1, 2, 3,..., n) a synchronism of pulse action takes place and the nutation interferogram can be measured "stroboscopically" between the pulses. The maximum time saving factor that can be obtained as compared to the conventional nutation experiment is of the order of the number of pulses used in a pulse train. The method has been successfully applied for determination of the asymmetry parameter for one of the two ~(35)Cl sites in polycrystalline 2, 4, 6-trichloro-1, 3, 5-triazine (cyanuric chloride).
机译：Harbison于1989年提出的二维章动NQR光谱法已成功用于在没有外部磁场的情况下确定粉末和单晶样品中自旋3/2核的EFG张量的不对称参数领域。然而，该方法固有的不便之处是需要很长的时间，因为必须针对各种RF脉冲长度重复进行数据采集。我们讨论了一种通过使用长度为t_w和距离为τ的相同的短RF脉冲序列来减少章动实验时间的方法。结果表明，对于NQR频率ω_0，频率偏移Δω和满足关系ω_0τ+Δωt_w = 2πk（k = 1，2，3，...，n）的脉冲参数，发生了脉冲作用的同步。并可以在脉冲之间“频闪”地测量章动干涉图。与常规章动实验相比，可获得的最大节省时间的因素是在脉冲序列中使用的脉冲数量级。该方法已成功地用于确定多晶2、4、6-6-三氯-1、3、5-三嗪（氰尿酰氯）中两个〜（35）Cl位置之一的不对称参数。

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