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首页> 外文期刊>Journal of magnetic resonance >Homogeneous broadenings in 2D solid-state NMR of half-integer quadrupolar nuclei
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Homogeneous broadenings in 2D solid-state NMR of half-integer quadrupolar nuclei

机译：半整数四极核在2D固态NMR中的均相加宽

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The question of the homogeneous broadening that occurs in 2D solid-state NMR experiments is examined. This homogeneous broadening is mathematically introduced in a simple way, versus the irreversible decay rates related to the coherences that are involved during t(1) and t(2). We give the pulse sequences and coherence transfer pathways that are used to measure these decay rates. On AIPO(4) berlinite, we have measured the Al-27 echo-type relaxation times of the central and satellite transitions on IQ levels, so that of coherences that are situated on 2Q. 3Q, and 5Q levels. We compare the broadenings that can be deduced from these relaxation times to those directly observed on the isotropic projection of berlinite with multiple-quantum magic-angle spinning (MAS), or satelite-transition MAS. We show that the choice of the high-resolution method, should be done according to the spin value and the corresponding homogeneous broadening. (c) 2006 Elsevier Inc. All rights reserved.
机译：研究了在2D固态NMR实验中发生的均相加宽问题。与在t（1）和t（2）期间涉及的相干性相关的不可逆衰减速率相比，以一种简单的方式在数学上引入了这种均匀加宽。我们给出了用于测量这些衰减率的脉冲序列和相干传递路径。在AIPO（4）berinite上，我们已经测量了中心和卫星跃迁在IQ水平上的Al-27回波型弛豫时间，因此相干性位于2Q。 3Q和5Q级别。我们将可以从这些弛豫时间推导出的增宽与通过多量子幻角旋转（MAS）或卫星转变MAS在柏林岩的各向同性投影上直接观察到的扩展进行比较。我们表明，高分辨率方法的选择应根据自旋值和相应的均匀展宽来进行。 （c）2006 Elsevier Inc.保留所有权利。

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