Multidimensional nuclear magnetic resonance in complex liquids analyzed by a simple model for non‐Markovian molecular reorientation
Multidimensional nuclear magnetic resonance in complex liquids analyzed by a simple model for non‐Markovian molecular reorientation
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通过非马尔可夫分子重新定向的简单模型分析复杂液体中的多维核磁共振
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发表时间：
1996
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通讯作者：
H. Sillescu
中科院分区：
文献类型：
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作者：
H. Sillescu
非马尔可夫分子重新取向的简单模型应用于过冷液体和接近玻璃化转变的聚合物中的多维核磁共振实验。相关时间分布的分量之间的交换过程与粘性系统中分子动力学中经常使用的“指数/非指数、同质/异质、马尔可夫/非马尔可夫和遍历/非遍历”概念相关。通过制定双态交换的详细示例，阐明了 2D 光谱和简化 4D 光谱在复杂液体中分子重新定向的机制和动力学方面的差异。
A simple model of non‐Markovian molecular reorientation is applied to multidimensional NMR experiments in supercooled liquids and polymers close to the glass transition. The process of exchange between components of a correlation time distribution is related with the notions ‘‘exponential/nonexponential, homogeneous/heterogeneous, Markovian/non‐Markovian, and ergodic/nonergodic’’ often used in relation with molecular dynamics in viscous systems. By working out a detailed example of two‐state exchange the difference between 2D and reduced 4D‐spectra with respect to the mechanism and dynamics of molecular reorientation in complex liquids is elucidated.