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Development of the 2-Dimensional Quasielastic Light Scattering Spectrometer

二维准弹性光散射光谱仪的研制

基本信息

批准号：
05555021
负责人：
HAYAKAWA Reinosuke
金额：
$ 5.63万
依托单位：
The University of Tokyo
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 1994
项目状态：
已结题

项目摘要

The purpose of this research project is to develop a 2-dimensional quasielastic light scattering (2D-QELS) spectrometer, which enables us to obtain detailed information on the microscopic fluctuation of various materials. The measurement method for 2D-QELS is based on a different technique producing 2-dimensional (2D) spectra from other 2D spectroscopies such as 2D-NMR and IR.In 1993, we assembled the 2D-QELS spectrometer which consisted of a laser, a high-voltage sinusoidal wave generator, a cell with parallel-plate electrodes, an optical mixing system in the heterodyne mode, and a detector unit with a photomultiplier and a photon counter. And some perparatory measurements for 2D-QELS were performed by using a simpler system with a photodiode and an A/D converter. In 1994, we made an interface unit between the 2D-QELS spectrometer and a personal computer, and incorporated a software program based on an extended Wiener-Khinchin theorem, which enabled us to obtain the 2D spectra directly from the scattered light intensity without calculating the autocorrelation function. Then the 2D-QELS spectrometer completed was applied to standard samples such as a polystirene latex and polystirene sulfonate in aqueous solutions. As a result, it was found that we could measure the phase delta of the complex electrophoretic mobility mu^*=muexp (idelta), which was unobtainable by the conventional method, determine the value of the amplitude mu more acculately, and detect the apparent diffusion constant D_<app> in the frequency range wider than the conventional method. The new measurement method used in 2D-QELS is expected to be applicable to the time-dependent flucuations on various kinds of periodically stationary systems.

该研究项目的目的是开发二维准弹性光散射（2D-QELS）光谱仪，使我们能够获得各种材料微观波动的详细信息。 2D-QELS 的测量方法基于与其他 2D 光谱学（例如 2D-NMR 和 IR）产生二维 (2D) 光谱的不同技术。1993 年，我们组装了 2D-QELS 光谱仪，该光谱仪由激光器、高压正弦波发生器、具有平行板电极的单元、外差模式的光学混合系统和带有光电倍增管和光子计数器的探测器单元。 2D-QELS 的一些预备测量是通过使用带有光电二极管和 A/D 转换器的更简单的系统进行的。 1994年，我们制作了2D-QELS光谱仪和个人计算机之间的接口单元，并结合了基于扩展维纳-辛钦定理的软件程序，使我们能够直接从散射光强度获得2D光谱，而无需计算自相关函数。然后将完成的 2D-QELS 光谱仪应用于标准样品，例如水溶液中的聚苯乙烯乳胶和聚苯乙烯磺酸盐。结果发现，我们可以测量传统方法无法获得的复数电泳迁移率 mu^*=muexp (idelta) 的相位 delta，更准确地确定振幅 mu 的值，并在比传统方法更宽的频率范围内检测表观扩散常数 D_<app>。 2D-QELS中使用的新测量方法有望适用于各种周期性静止系统的时间相关波动。