光による非破壊デプスプロファリング分析の基礎研究
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概要
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Two optical methods, FT-IR/ATR and photothermal beam deflection, were intensively investigated concerning their applicability to nondestructive depth profiling. The FT-IR/ATR depth-profiling method was applied to a nondestructive determination of the depth distribution of the saponification degree in a diacetylcellulose film sample. The depth profile of the acetyl groups was reconstructed based on the signal-intensity dependence to the incident angles of the IR beam. The applicability of the FT-IR/ATR method was confirmed from the agreement with results obtained from two destructive methods, FT-IR microscopy and neutralization titration. The optical beam deflection signal, which was enhanced for a single microparticle due to a localization of the temperature field by the curvature of the sample, was theoretically derived and experimentally verified. The result was applied to a nondestructive estimation of the surface adsorption-layer thickness of a single microparticles. It was shown that the distribution of the absorbing species in the microparticle could be determined from the dependence of the phase signal on the modulation frequency. In addition, a correction method for the signal intensity by using a phase signal was also proposed in order to improve the poor reproducibility in quantitative measurements. The validity of this signal-correction method was experimentally demonstrated regarding its application to immunological samples. Another new type of photothermal spectrometry which utilizes coaxial excitation and probe beams under a microscope was developed in order to apply this method to micro-objects, such as biological samples. It was concluded that these methods are strong candidates for nondestructive three-dimensional measurement techniques.
- 社団法人日本分析化学会の論文
- 1994-01-05
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