Abstract
<p indent=0mm>In this paper, we outline the exploration on application of the concept of orthogonality in the development of methodology of 2D-COS. The studies include: (1) characterization of intermolecular interaction between two solutes dissolved in the same solutions: in the approach, we design special concentration series. In the construction of 2D correlation spectra, interference signals irrelevant to intermolecular interaction are removed <italic>via</italic> dot production of a pair of vectors that are orthogonal to each other. Consequently, intermolecular interaction can be probed by cross peaks in the resultant 2D correlation spectra. (2) Analysis of bilinear data produced by chromatographic-spectroscopic and analogous experiments on mixed samples: <italic>via</italic> the self-orthogonality of the Hilbert-Noda matrix, implicit but intrinsic invariance can be manifested as systematic absence of cross peaks (SACPs). As a result, spectra of pure components can be retrieved even if the elution profiles of different components are still severely overlapped after separation process.
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