Development of High Performance System for the Direct Measurements of Photoelectron Diffraction Patterns

Research Project

Project/Area Number	58850160
Research Category	Grant-in-Aid for Developmental Scientific Research
Allocation Type	Single-year Grants
Research Field	工業分析化学
Research Institution	The University of Tokyo
Principal Investigator	NIHEI Yoshimasa 東京大学, 生技研, 助教授 (10011016)
Project Period (FY)	1983 – 1985
Project Status	Completed (Fiscal Year 1985)
Budget Amount *help	¥12,300,000 (Direct Cost: ¥12,300,000) Fiscal Year 1985: ¥1,000,000 (Direct Cost: ¥1,000,000) Fiscal Year 1984: ¥3,000,000 (Direct Cost: ¥3,000,000) Fiscal Year 1983: ¥8,300,000 (Direct Cost: ¥8,300,000)
Keywords	Photoelectron diffraction / photoelectron spectroscopy / image acquisition system / two-dimensional detector / surface structural analysis / image processing / 放射光
Research Abstract	The purpose of this project is the development of the display system of the photoelectron diffraction image, in order to enable rapid acquisition of two-dimensional photoelectron diffraction patterns. In the first step, basic hardware was assembled by the combination of the retarding field electron energy analyzer, the microchannel plate, the TV camera and the real-time image processor. By using the elastically scattered electron beam, the energy resolution of 1 eV at 900 eV kinetic energy was confirmed. In the second step, as the result of the development of the pulse-counting acquisition mode, which was achieved by differentiation and 1-bit A/D conversion of the video signal, the photoelectron energy spectra excited with the X-ray, which had low flux relative to the electron beam, were obtained. The angular resolution of the analyzer was confirmed to be +/- 0.5゜ from the measurement of low-energy electron diffraction spots. In the final step, investigations were performed of the relationship between X-ray irradiation area and energy resolution, of image accumulation/processing and of the correction method of the image distortion, in order to improve the total throughput of the system. Further project to utilize the synchrotron ratiation has been started, in order to achieve ultimate performance of this system.