Auger-photoelectron coincidence-spectroscopic studies of the relaxation processes for core-level excitied states in solids

我们的研究计划是建立一种有效的固体俄歇-光电子符合谱方法。我们需要两台电子能量分析仪来分析俄歇电子和核心光电子的能量，它们是通过软x射线照射从固体样品中发射出来的。此外，必须同时检测两台分析仪的电子，以表明两个电子来自同一激发衰变事件。在这个实验中，每个能量分析仪看到的样品上的小区域（1mm^2）与激发软x射线击中的样品上的区域相互重叠是至关重要的。今年是我们三年计划的最后一年。今年我们考虑了一些对策，以解决去年实验中出现的困难。考虑的主要对策是：利用高电导率的钼金属板更彻底地消除残余磁化，提高性能，在两台分析仪前安装电子透镜，构建新的能量分析系统定位装置，改进控制俄热电子和光电子信号同时检测系统的计算机软件。考虑到这些对策，同步探测系统已基本完成。在系统的某些部分取得了比预期更好的性能。偶合光谱学的日常工作已经成为可能，尽管仪器的完成只是稍微推迟了一点。对于金属Ce，初步发现在Ce三维光电发射过程的最终状态和Ce M_<4,5>N_<4,5>N_<6,7>奥歇弛豫过程的初始状态之间的中间状态存在显著的弛豫过程。这一过程似乎与ce4f水平有关。这个结果对于重电子系统的问题是非常有趣的。利用我们的俄歇-光电子重合检测系统，将观察到包括上述显著弛豫过程在内的新的有趣结果。我们希望我们的项目将有助于阐明固体中激发态的弛豫过程。少

Our research project has been planed to establish an effective method of the Auger-photoelectron coincidence spectroscopy for solids. We need two electron energy analyzers to analyze the energies of both Auger electrons and core photoelectrons which are emitted from a solid sample by irradiating soft x-rays. In addition, the simultaneous detection of electrons from both analyzers must be made to show that both electrons came from the same excitation-decay event. In this experiment, it is essential that the small area (1mm^2) on the sample which every energy analyzer sees, and the area on the sample which the exciting soft x-rays hit, overlap each other.This year is final one in the schedule of our three-year-project. We considered some counterplans this year to resolve difficulties which had arisen on the performance of the experiments in last year. Main counterplans considered are as follows : more complete elimination of remanent magnetization with use of mu-metal sheets of high perm … More eability, the installation of electron lenses in front of both analyzers, the construction of the new positioning apparatus for the energy analyzing system, and the improvement of the computer software for the control of the simultaneous detection system of Auger electron and photoelectron signals. The simulteneous detection system has nearly been completed with these consideration of the counterplans. Better performances in some parts of the system were obtained than expected. The routine work of the coincidence spectroscopy has become possible, although the completion of the apparatus was delayd just a little.For Ce metal, a preliminary result has been obtained that the existence of remarkable relaxation process is suggested in an intermediate state between the final state of the Ce 3d photoemission process and the initial state of the Ce M_<4,5>N_<4,5>N_<6,7> Auger relaxation process. This process seems to be correlated with the Ce 4f level. This result is very interesting in relation to problems of the heavy electron system. With our Auger-photoelectron coincidence detection system, new interesting results including above-mentioned remarkable relaxation process will be observed. We hope that our project will contribute greatly to the elucidation of relaxation processes for exited states in solids. Less