Long-lived states in solution NMR: Theoretical examples in three- and four-spin systems
Long-lived states in solution NMR: Theoretical examples in three- and four-spin systems
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DOI：
10.1016/j.jmr.2008.04.030
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发表时间：
2008-08-01
影响因子：
2.2
通讯作者：
Vinogradov, Elena
中科院分区：
文献类型：
--
作者：
Grant, Aaron K.;Vinogradov, Elena
长寿命的自旋态已经在各种系统中被观察到。虽然在双自旋系统中，这些状态的长寿命背后的动力学是很好理解的，但在包含更多自旋的系统中，相应的动力学似乎更加复杂。最近，它已被证明，分子内偶极弛豫介导的过渡的选择规则可能会发挥作用，在确定寿命长的状态，在系统中包含任意数量的自旋。在这里，我们提出了一个理论，在系统中含有三个和四个自旋的长寿状态，并演示了它如何可以用来识别状态，有很少或没有分子内偶极弛豫。(c)2008年由Elsevier Inc.出版
Long-lived spin states have been observed in a variety of systems. Although the dynamics underlying the long lifetimes of these states are well understood in the case of two-spin systems, the corresponding dynamics in systems containing more spins appear to be more complex. Recently it has been shown that a selection rule for transitions mediated by intramolecular dipolar relaxation may play a role in determining the lifetimes of long-lived states in systems containing arbitrary numbers of spins. Here we present a theory of long-lived states in systems containing three and four spins and demonstrate how it can be used to identify states that have little or no intramolecular dipolar relaxation. (c) 2008 Published by Elsevier Inc.