レーザーマイクロプローブ質量分析法に関する分析化学的研究

概要

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It has been difficult to obtain chemical-state information in microprobe analysis. This thesis presents the application and development of laser microprobe mass spectrometry (LAMMS) for this purpose. In the first study, analysis of an insulating polycarbonate surface treated with a silane coupling agent is presented. The surfactant in the agent is effective for generating different chemical species in the treated layers and for their homogenization. The second study describes the sensitive detection of acid components on deteriorated stone. The detection of nitrogen- and sulfur-oxide ions indicates the acceleration of stone deterioration by acid rain. In the third study, a structural interpretation of the silicate network is carried out using the Si/O ratio of the fragment ions. The calculated Si/O ratio coincided with the ratio obtained from the fragment ions detected, depending on the network structure. In the fourth study, the time dependence of ionization is presented. Since a high power laser pulse makes the fine structure of secondary ionization observable, the behavior difference between Al and Au has become clear. In conclusion, LAMMS is useful for sensitive chemical-state and microprobe analysis, especially of insulator materials. Further it is suggested that the interpretation of ionization behavior due to the thermal process has possibility for a new chemical-state analysis.
1996-02-05