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

开发高灵敏度分析仪器，用于使用激光激发测定定向分子。

基本信息

批准号：
05555227
负责人：
OGAWA Teiichiro
金额：
$ 5.38万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1995
项目状态：
已结题

项目摘要

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.

开发高灵敏度、高信息量的新型分析仪器是现代分析化学的重要目标。当激光照射非对称取向的样品时，入射激光产生第二谐波光束。该原理可用于气液界面和液液界面吸附分子的测定。激光入射到表面的角度可以任意控制，二次谐波产生的角度依赖性可以很容易地测量。因此，分子取向的测定可以进行没有假设和选择的最佳入射角的分析目的，可以很容易地发现。激光双光子电离仪进行了改进，通过使用新的电源单元，这是购买的赠款。采用更高的电压提高了电荷的收集效率，提高了灵敏度。新仪器和改进仪器的典型检出限如下：激光双光子电离法······水中芘·······0.2fmol·······金属上BBQ······0.1pmol激光二次谐波产生·······玻璃上DEOC······0.2pmol，这些值优于以往的研究，基本达到了项目的初步目的。