Vacuum Ultraviolet Emission Spectra of Organic Photoconductors Excited by Low Energy Electrons.

这项工作的目的是直接观察有机光导体中未占据能级的电子结构，这项工作已经进行了两年，因为这些能级的实验研究甚至比价能级少，尽管它们在物理和化学性质方面很重要。本工作的主要目的是研制一种仪器，用于测量在真空中用低能电子照射固体或薄膜样品时，根据电子弛豫向低未占能级发射的真空紫外光。我们设计了这样一台由测量室、电子枪放置系统、光检测系统、样品传送系统和样品制备室组成的超高真空兼容仪器，通过从测量原理到机械实际加工的各个方面的审查，并在上一财年末达到了组装仪器的最后阶段。在本财政年度，我们继续调整该工具的各个部分。在对约翰逊型电子枪进行了大幅度改进后，在设计中发现了一个在计划阶段没有预见到的严重问题，从而再现了具有重要意义的部分。此外，我们改进了光聚焦系统和探测器第一阳极的敏化剂，以提高真空紫外光的灵敏度。考虑到京都大学固体物理研究所研究人员的建议。另一方面，在对样品冷却系统进行故障排除时，仪器的超高真空被意外打破，该系统旨在减少电子照射对有机样品的辐射损害。由于每次尝试追踪泄漏的来源都失败了，仪器被送回位于大阪的工厂，发现制备室的主阀已经坏了。虽然（国外）订购了替代品，但地震袭击了兵库县南部地区，损坏了我们的仪器，需要大修。然而，它的重建工作在本财政年度结束时几乎已经完成。因此，本项目第一个计划所包括的对有机光导体中未利用水平的直接观察尚未开始。然而，在这项赠款的财政支持下，为此目的有用的工具几乎已经完成。我们将充分利用它来研究有机固体化学。少

This work, the object of which is to observe directly the electronic structure of unoccupied levels in organic photoconductors, has been carried out for these two years, since those levels are even less studied experimentally than valence levels in spite of their importance in relation to physical and chemical properties.The main program of this work is to make an instrument for the measurement of vacuum ultraviolet light emitted in accordance with electronic relaxations to low unoccupied levels in a sample solid or thin film irradiated with low energy electrons in vacuo. We designed such an ultra-high vacuum compatible instrument consisting of a measurement chamber, a system for lodging an electron gun, a light detection system, a sample transfer system and a sample preparation chamber, through examinations of various aspects from measurement principles to practical processing of machineries, and reached a final stage to assemble the instrument at the end of the last fiscal year.In th … More is fiscal year we continued to adjust respective parts of the instrument. A severe problem which could not been foreseen at the stage of planning was found on a high-intensity low-energy electron gun designed with improving a Johnson-type one considerably, so that the parts of significance have been reproduced. Further, we have improved a light focusing system and a sensitizer at the first anode of the detector to increase the sensitivity for vacuum ultraviolet lights. With taking account of advices of researchers at the Institute for Solid State Physics, the University of Kyoto. On the other hand, ultra-high vacuum of the instrument was broken accidentally, when a sample cooling system, aimed to diminish a radiation damage by electron irradiation on an organic sample, was being troubleshooted. As every trial to trace the origin of the leak was failed, the instrument was returned to manufactory located at Osaka, and it was found that the main valve of the preparation chamber had been out of order. While its substitute was ordered (abroad), the earthquake attacked the southern area of the Hyogo Prefecture and damaged our instrument, which needed an overhaul. However, its reconstruction has almost been completed at the end of this fiscal year.Thus, the direct observation of unoccupied levels in organic photoconductors, included in the first plan of this project, has not yet been started. Nevertheless, the instrument to be useful for this purpose has almost been completed by the financial support of this Grant-in-Aid. We will make the most of it to studies of organic solid state chemistry. Less