Triple quantum NMR on spin systems with I = 3/2 in solids
Triple quantum NMR on spin systems with I = 3/2 in solids
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DOI：
10.1063/1.441857
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发表时间：
1981-07
影响因子：
4.4
通讯作者：
S. Vega;Y. Naor
中科院分区：
文献类型：
--
作者：
S. Vega;Y. Naor
研究了I = 3/2的四极自旋体系中三量子相干的激发和检测的脉冲核磁共振实验。采用两种实验方法：对于四极频率较小的系统，采用弱射频辐照脉冲直接进行三量子激发和探测。对于较大的四极频率，调制射频脉冲被应用于三重量子相干的产生和监测。调制射频脉冲技术也用于寻找四极频率和选择性地激发I = 3/2核的中心频率谱线。23Na（I = 3/2）核磁共振实验证明了这些技术在四水酒石酸铵钠取向单晶上的应用。
Pulsed NMR experiments are developed for the excitation and the detection of triple quantum coherences in quadrupolar spin systems with I = 3/2. Two experimental methods are used: For systems with small quadrupolar frequencies direct triple quantum excitation and detection is accomplished by weak rf irradiation pulses. For large quadrupolar frequencies modulated rf pulses are applied to create and to monitor triple quantum coherences. Modulated rf pulse techniques are also used to search for quadrupolar frequencies and to excite selectively center frequency spectral lines of I = 3/2 nuclei. Applications of these techniques are demonstrated by 23Na(I = 3/2) NMR experiments on an oriented single crystal of sodium ammonium tartarate tetrahydrate.