Development of an Advanced Equipment for Systematic Measurement of Photochemical Properties

光化学和光物理学的最新进展是研究开发用于光存储器和光处理器的新型光响应材料。在这些研究中，光化学性质如光反应量子产率和极化是基本的。本研究的目的是组装一种系统设计的用于测量光化学性质的设备。该设备由以下三部分组成。(1)单色激发光源采用两种光源：用于光化学反应的λ可调谐激光器（Ti：蓝宝石激光器）和用于荧光测量的150-W Xe光源。(2)高灵敏度荧光分光光度计弱荧光由多色马达（F25）分散，用能探测单光子水平发射的线阵多通道光子计数检测器（Hamamatsu IMD-PC）检测。(3)样品室及其外围设备样品设置在真空室内，真空室内有三个机械百叶窗，将上述两个光源的光路切换到多色仪。设备全部组装完成，并进行了灵敏度测试。结果表明，该仪器的灵敏度比常规荧光分光光度计高100倍。

Recent acvance of photochemistry and photophysics is directed toward researchs of development of new photoresponsive materials for optical memories and optical processrors. In these researches, photochemical properties like photoreaction quantum yields and polarization are fundamental. The purpose of the present study is to assemble an equipment systematically designed for measuring photochemical properties. The equipment is conposed of the following three parts.(1) Monochromatic excitation light sources Two light sources are employed : a lambda-tunable laser (Ti : sapphire laser) for photochemical reactiion and a 150-W Xe light for fluorescence measurement.(2) High-sensitivity fluorescence spectrophotometer Weak fluorescence is dispersed by a polychromotor (F25) and is detected with a linear-array multichannel photon-counting detector (Hamamatsu IMD-PC) which is capable of detecting emission of single-photon level.(3) Sample compartment and its peripherals A sample is set inside a vacuum compartment with three mechanical shutters switching the light paths from the above two light sources and to the polychromator.The equipment was totally asembled and was tested the sensitivity. It was found that the equipment has a sensitivity higher 100 times than an conventional fluorescence spectrophotometer.