Time-resolved Fourier transform infrared spectroscopic imaging
Time-resolved Fourier transform infrared spectroscopic imaging
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DOI：
10.1366/00037020360625880
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发表时间：
2003-04-01
影响因子：
3.5
通讯作者：
Levin, IW
中科院分区：
文献类型：
--
作者：
Bhargava, R;Levin, IW
傅里叶变换红外（FT-IR）成像由于其多通道检测优势，可以同时对大空间区域进行光谱表征。然而，在多通道配置中大量数据的采集导致顺序采集的数据集的时间分辨率差，这限制了对具有分钟量级的特征时间尺度的过程的动态过程的检查。在这里，我们介绍的概念和仪器细节的时间分辨红外光谱成像方式，允许检查重复的动态过程，其半衰期是毫秒的顺序。作为一个例子，这种实施的步进扫描FTIR成像，我们研究的分子响应外部电场扰动的微观异质聚合物-液晶复合材料。使用传统的单变量和广义二维（2D）相关方法的光谱数据的分析强调了额外的能力，同时访问的空间和时间的化学测量的分子动态过程。
Fourier transform infrared (FT-IR) imaging allows simultaneous spectral characterization of large spatial areas due to its multichannel detection advantage. The acquisition of large amounts of data in the multichannel configuration results, however, in a poor temporal resolution of sequentially acquired data sets, which limits the examination of dynamic processes to processes that have characteristic time scales of the order of minutes. Here, we introduce the concept and instrumental details of a time-resolved infrared spectroscopic imaging modality that permits the examination of repetitive dynamic processes whose half-lives are of the order of milliseconds. As an illustration of this implementation of step-scan FTIR imaging, we examine the molecular responses to external electric-field perturbations of a microscopically heterogeneous polymer-liquid crystal composite. Analysis of the spectroscopic data using conventional univariate and generalized two-dimensional (2D) correlation methods emphasizes an additional capability for accessing of simultaneous spatial and temporal chemical measurements of molecular dynamic processes.