Three-dimensional imaging of molecular orbitals by the electron-electron-ion coincidence experiment

电子动量谱（EMS）允许我们测量分子轨道模式。它包括一个高能电子碰撞电离实验，其中所有电子的运动学完全确定与两个传出电子的重合检测。虽然各种分子轨道已被广泛研究的EMS，所得到的信息仅限于径向部分的波函数由于随机取向的目标分子。本项目的目标是发展一种基于EMS的新方法，通过碎片离子的进一步符合探测来观察三维轨道模式。研制了电子线路和碎片吨探测器。结合现有的EMS谱仪，完成了本课题的装置.非弹性散射电子与碎片子的符合实验 ...更多信息 对氮分子进行了电子轰击内壳层激发。虽然已经成功地检测到符合信号，但统计学不好。这一观察结果表明，成像技术是最适合在这个项目中的碎片离子检测。本文研究了几种双原子分子的光电子与碎片离子之间的角关联。通过实验与理论的比较发现，大多数的价层电离跃迁都伴随着快速的离子解离过程，可以用于本课题的研究.一个新的EMS装置已经建成，其中的两个出射电子的位置敏感探测器。他们的能力，同时能量和角度分散测量引起相当大的改善，在数据收集speed.Application的成像技术，碎片离子检测以及电子正在考虑中，以提高这里的方法，成为全新的光谱轨道图案imaging。少

Electron momentum spectroscopy (EMS) allows us to measure molecular orbital pattern. It. consists of a high-energy electron-impact ionization experiment in which kinematics of all the electrons are fully determined with coincident detection of the two outgoing electrons. While a variety of molecular orbitals have been widely studied by EMS, the resulting information is limited only to the radial part of wavefunction due to randomly oriented target molecules. This project has aimed to develop a new method, based on EMS, for looking at three-dimensional orbital patterns by further coincident detection of fragment-ion.Within the period of the present grant-in-aid the following attempts have been made.1. An electronic circuit and a fragment-ton detector have been constructed. By combining these with the present EMS spectrometer an apparatus for this project has been completed.2. Coincidence experiments for inelastically scattered electrons and fragment-tons, which are generated by the elec … More tron-impact inner-shell excitation, have been carried out for nitrogen molecule. While coincidence signal has been successfully detected, the statistics is not good. This observation indicates that the imaging technique is best suited for fragment-ion detection in this project.3. Angular correlations between photoelectrons and fragment-ions have been studied for several diatomic molecules. From comparison of experiments and theory it has been found that most of valence-shell ionization transitions are followed by the fast ion dissociation processes, and can be used for this project.4. A new EMS apparatus has been constructed, where for the two outgoing electrons two position-sensitive detectors are employed. Their ability of simultaneous energy- and angle-dispersive measurements gives rise to considerable improvement in data gathering speed.Application of the imaging technique to fragment-ion detection as well as the electrons are under consideration in order to raise the methodology here to become brand-new spectroscopy for orbital pattern imaging. Less