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Applications of the New Family of Coherent Multidimensional Spectroscopies for Analytical Chemistry
Annual Review of Analytical Chemistry ( IF 5.9 ) Pub Date : 2017-06-12 00:00:00 , DOI: 10.1146/annurev-anchem-061516-045349
John C. Wright 1
Affiliation  

A new family of vibrational and electronic spectroscopies has emerged, comprising the coherent analogs of traditional analytical methods. These methods are also analogs of coherent multidimensional nuclear magnetic resonance (NMR) spectroscopy. This new family is based on creating the same quantum mechanical superposition states called multiple quantum coherences (MQCs). NMR MQCs are mixtures of nuclear spin states that retain their quantum mechanical phase information for milliseconds. The MQCs in this new family are mixtures of vibrational and electronic states that retain their phases for picoseconds or shorter times. Ultrafast, high-intensity coherent beams rapidly excite multiple states. The excited MQCs then emit bright beams while they retain their phases. Time-domain methods measure the frequencies of the MQCs by resolving their phase oscillations, whereas frequency-domain methods measure the resonance enhancements of the output beam while scanning the excitation frequencies. The resulting spectra provide multidimensional spectral signatures that increase the spectroscopic selectivity required for analyzing complex samples.

中文翻译:


新型相干多维光谱学家族在分析化学中的应用

出现了一个新的振动和电子光谱学家族,其中包括传统分析方法的连贯类似物。这些方法还是相干多维核磁共振(NMR)光谱的类似物。这个新家族基于创建相同的量子力学叠加态,称为多重量子相干(MQC)。NMR MQC是核自旋态的混合物,可保留其量子力学相位信息数毫秒。这个新系列中的MQC是振动状态和电子状态的混合体,它们的相位可以保持皮秒或更短的时间。超快速,高强度相干光束会迅速激发多种状态。被激发的MQC在保持其相位的同时发出明亮的光束。时域方法通过解决MQC的相位振荡来测量其频率,而频域方法则在扫描激励频率时测量输出光束的共振增强。所得光谱提供了多维光谱特征,从而增加了分析复杂样品所需的光谱选择性。

更新日期:2017-06-12
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