Seliger J, Zagar V
Jozef Stefan Institute, Ljubljana, Slovenia.
J Magn Reson. 2008 Oct;194(2):175-81. doi: 10.1016/j.jmr.2008.06.021. Epub 2008 Jul 3.
The sensitivity of the Slusher and Hahn's nuclear quadrupole double resonance technique is calculated in general for an arbitrary nuclear spin S of the quadrupole nuclei and for an arbitrary asymmetry parameter eta of the electric field gradient tensor. The nuclear spin S=5/2 ((17)O, (25)Mg, ...) is treated in details. The influence of the cross-relaxation rate between the quadrupole nuclei and the abundant spin system on the sensitivity of double resonance is discussed. The results of the theoretical analysis are applied in the analysis of the (1)H-(17)O nuclear quadrupole double resonance spectra in p-toluenesulfonamide and 2-nitrobenzoic acid. The 17O nuclear quadrupole resonance frequencies from a sulfonamide group are determined for the first time. The proton-oxygen cross-relaxation rates and the proton local frequency in zero external magnetic field are experimentally determined from the nuclear quadrupole double resonance spectra.
一般来说，针对四极核的任意核自旋S以及电场梯度张量的任意不对称参数η，计算了斯拉舍和哈恩的核四极双共振技术的灵敏度。详细讨论了核自旋S = 5/2（（17）O、（25）Mg等）的情况。探讨了四极核与丰富自旋系统之间的交叉弛豫率对双共振灵敏度的影响。理论分析结果应用于对对甲苯磺酰胺和2-硝基苯甲酸中（1）H-（17）O核四极双共振谱的分析。首次测定了来自磺酰胺基团的17O核四极共振频率。通过核四极双共振谱实验测定了质子-氧交叉弛豫率和零外磁场中的质子局部频率。
