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Development and Applications of Time-Resolved M ssbauer Spectroscopy

时间分辨穆斯堡尔谱的发展与应用

基本信息

批准号：
59840018
负责人：
MAEDA Yutaka
金额：
$ 3.52万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research
财政年份：
1984
资助国家：
日本
起止时间：
1984 至 1986
项目状态：
已结题

项目摘要

a time-resolved Mossbauer spectroscopy is considered to be very useful for unconventional Mossbauer experiments such as delayed coincidence and fast velocity-channel sweep experiments. In this project we developed a low cost and versatile Mossbauer spectrometer using a one-board microprocessor and a personal computer, which enables us to make multi-parameter and fast velocity-channel sweep experiments.Our system is operated under a program control and allows us to choose two different modes by substituting the program.Normal mode: Usual Mossbauer spectra are obtained in this mode. The system operates as multiscalers and features a capability for simultaneous recording of multiple independent spectra.Event processing mode: This mode is useful for recording a spectrum with fast velocity-channel sweep, and a multi-parameter measurement is also easily accomplished. When an event ( -ray detection) occurs, the data of the momentary velocity and the other experimental parameters such as time, temperature and fields, if required, are stored in the microprocessor, and then processed in accordance with the purpose of the experiment using the personal computer. For example, in a delayed-coincidence Mossbauer experiment it is necessary to divide the time scale into several intervals and record time-resolved Mossbauer spectra. Our system is also used to measure the Mossbauer spectral change after photo-dissociation of the ligand in hemoproteins such as myoglobin-CO compound, at low temperatures.

时间分辨穆斯堡尔谱被认为对于非常规穆斯堡尔实验如延迟符合和快速通道扫描实验是非常有用的。本项目采用单板微处理器和个人计算机开发了一种低成本、多功能的穆斯堡尔谱仪，使我们能够进行多参数、快速的速度通道扫描实验。我们的系统在程序控制下运行，允许我们通过替换程序选择两种不同的模式。正常模式：在该模式下获得通常的穆斯堡尔谱。该系统作为多定标器运行，具有同时记录多个独立光谱的能力。事件处理模式：该模式可用于记录具有快速速度通道扫描的光谱，也可轻松完成多参数测量。当一个事件（射线检测）发生时，瞬时速度和其他实验参数，如时间，温度和字段，如果需要的话，数据存储在微处理器，然后根据实验的目的使用个人计算机进行处理。例如，在延迟符合穆斯堡尔实验中，有必要将时间尺度分成几个间隔，并记录时间分辨的穆斯堡尔谱。我们的系统也被用来测量低温下血红素蛋白如肌红蛋白-CO化合物中配体光解后的穆斯堡尔谱变化。