DEVELOPMENT OF A HIGHLY-SENSITIVE ANALYTICAL INSTRUMENT FOR THE DETERMINATION OF ORIENTED MOLECULES USING A LASER FOR EXCITATION.

开发一种新的高度敏感和信息性分析仪器是现代分析化学的一个关键目标。事件激光器的第二束谐波光束在激光器的辐射中产生了一个不对称取向的样本。这一原则可能被用于确定空气-液体表面和液体-液体接口上的吸附分子。一个新的仪器是由使用几何仪和精确度阶段构建的，是由授予的。激光器对表面的事件角度可能是受控的仲裁，而第二代谐波生成的角度依赖可能是容易衡量的。因此，分子取向的确定性可以在没有假设的情况下被携带，并且在分析目标的情况下可以容易地找到最佳数值角度的选择。激光双光子电离仪器的改进是通过使用一个新的功率供应单元来携带的，其中是通过赠款来购买的。高投票权的应用增加了收集电子充电和增强敏感性的有效性。新的和修订的仪器的典型检测限制也将被跟踪：激光双光子电离法...... 0.2 pmol These values are better than previous investigations and the initital purpose of the project has been approximately fulfillled。

Development of a new highly-sensitive and informative analytical instrument is a key target of the modern analytical chemistry. A second harmonic light beam of the incident laser is produced when the laser irradiate a sample of unsymmetrical orientation. This principle may be used for determination of adsorbed molecules at the air-liquid surface and liquid-liquid interface.A new instrument was constructed by using a goniometer and precision stage, which were purchased by the grant. The incident angle of the laser to the surface could be controlled arbitaray, and the angular dependence of the second harmonic generation could be easily measured. Thus, the determination of molecular orientation could be carried out without assumption and the selection of the optimum incident angle for an analytical purpose could be easily found.An improvement of the laser two-photon ionization instrument was carried out by using a new power supply unit, which was purchased by the grant. Application of a higher votage increased the collection efficiency of electric charge and enhanced the sensitivity.The typical detection limits of the new and revised instruments are as follows : Laser two-photon ionization method・・・・・・Pyrene on water・・・・・・0.2fmol・・・・・・BBQ on metal・・・・・・0.1pmol Laser second-harmonic generation・・・・・・DEOC on glass・・・・・・0.2pmol These values are better than previous investigations and the initital purpose of the project has been approximately fulfillled.