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Time-resolved optical waveguide absorption spectroscopy (OWAS) makes use of an evanescent field to detect the polarized absorption spectra of sub-monomolecular adlayers. This technique is suitable for the investigation of kinetics at the solid/liquid interface of dyes, pigments, fluorescent molecules, quantum dots, metallic nanoparticles, and proteins with chromophores. In this work, we demonstrate...
The smuggling of liquid precursor chemicals greatly harms social public security. In this paper a method based on principal component analysis (PCA) is presented to recognize the EDXRS spectra of liquid precursor chemicals. Scatter profiles of acetone, acetic anhydride,2-butanone and isosafrole are obtained by using EDXRS. As the similarity of the profiles, it is difficult to identify samples, so...
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