Development and Applications of Time-Resolved M ssbauer Spectroscopy

时间分辨穆斯堡尔谱被认为是非常有用的非常规穆斯堡尔实验，如延迟符合和快速速度通道扫描实验。在这个项目中，我们用一台单板微处理器和一台个人计算机开发了一台低成本、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，允许我们通过替代程序来选择两种不同的模式。正常模式：通常在这种模式下获得穆斯堡尔谱。该系统以多标度计运行，具有同时记录多个独立光谱的能力。事件处理模式：该模式适用于记录具有快速速度通道扫描的光谱，并且也很容易实现多参数测量。当事件(射线探测)发生时，瞬时速度数据和其他实验参数，如时间、温度和场，如果需要，存储在微处理器中，然后使用个人计算机根据实验目的进行处理。例如，在延迟符合穆斯堡尔实验中，有必要将时间尺度划分为几个间隔，并记录时间分辨的穆斯堡尔谱。我们的系统还被用来测量低温下肌红蛋白-CO化合物等血红蛋白中配体光解后的穆斯堡尔光谱变化。

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.