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同步辐射光源是目前世界上最好的光源,用它测量EXAFS谱自然效果极好.然而由于它设备庞大而昂贵,无法普及到一般实验室.转靶X光机比同步辐射装置要简单和便宜得多,但这种光源的性能不如同步辐射,每次实验所需时间也长得多.本文要介绍的激光EXAFS谱仪是用激光打到金属靶上所产生的X射线脉冲作为光源,并用拍照的方法记录EXAFS谱.其设备更加简单和便宜,而且测得EXAFS谱所需时间极短.当然这种方法也有它的局限性和缺点,例如一般只适用于测量较轻元素的EXAFS谱.激光EXAFS谱仪的结构如图所示.由钕玻璃激
The synchrotron radiation source is the best light source in the world and the EXAFS spectrum measured by it is of excellent natural effect, however, due to its large and expensive equipment, it can not be universally used in general laboratories. The target X-ray machine is simpler and cheaper than the synchrotron radiation device Much, but the performance of this light source is not as good as synchrotron radiation, the time required for each experiment is much longer.This article describes the laser EXAFS spectrometer is a laser hit the metal target generated by the X-ray pulse as a light source, and use The method of photographing records the EXAFS spectrum, which is simpler and cheaper, and requires very little time to measure the EXAFS spectrum, although it also has limitations and drawbacks, such as the EXAFS spectrum, which is generally only suitable for measuring lighter elements. The structure of the laser EXAFS spectrometer is shown in the figure