Power spectra are a powerful tool provided by two-dimensional correlation analysis. However, this tool is seldom used in practice. This work shows selected examples of using of the power spectra for the study of various kinds of samples with the aim to promote more common use of this tool. By examination of the power spectrum of specific sample, one can estimate the sensitivity of different molecular fragments on a given perturbation. Determination of the power spectra for smaller data subsets provides information on the dynamics of perturbation-induced spectral changes. If the experimental spectra of different samples in the same perturbation window are recorded, the comparison of the power spectra yields information on differences in the sensitivity of various samples on common perturbation. This possibility is particularly useful for studies of the spectra-structure correlations, interactions, and molecular dynamics. A comparison of the power spectra obtained by using different reference spectra provides information on the nature of spectral changes at different wavenumbers.

中文翻译：

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EXPRESS：二维相关光谱：功率谱的力量

功率谱是二维相关分析提供的强大工具。然而，这个工具在实践中很少使用。这项工作展示了使用功率谱研究各种样本的选定示例，目的是促进该工具的更普遍使用。通过检查特定样品的功率谱，可以估计不同分子碎片对给定扰动的敏感性。较小数据子集的功率谱的确定提供了关于扰动引起的谱变化的动态的信息。如果记录同一扰动窗口中不同样品的实验光谱，则功率谱的比较会产生有关各种样品对常见扰动的灵敏度差异的信息。这种可能性对于研究光谱-结构相关性、相互作用和分子动力学特别有用。通过使用不同参考光谱获得的功率谱的比较提供了有关不同波数下光谱变化性质的信息。