| Theoretical calculation of the modulation transfer function in a femoto-second electron diffraction system | |
Tian Jin-Shou ; Zhao Bao-Sheng; Wu Jian-Jun; Zhao Wei; Liu Yun-Quan; Zhang Jie
| |
| 2006-07-01 | |
| 发表期刊 | ACTA PHYSICA SINICA
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| 卷号 | 55期号:7页码:3368-3374 |
| 摘要 | This article has introduces the basic components and characteristics of a femoto-second electron diffraction system, i.e. the photo-cathode, magnetic lens, deflector and detector with doubled MCP etc., and demonstrated our design method and results. The photo-cathode is an Ag film deposition on a sapphire disk and the femtosecond electron pulses are accelerated to 50 keV through an extraction electric field of 10kV/mm between the photocathode and the extraction mesh. After extraction, the electron pulses are reshaped in size by a 100 mu m pinhole, which screens out electrons with larger elevation angle and makes the passed electrons flying almost parallel to the axis, which results in a reduced electron beam spot. The beam is collimated with a magnetic lens and positioned to the sample by a pair of deflection plates for diffraction measurements. The electron diffraction images are recorded with a two-dimensional imaging system composed of a Chevron-type microchannel plate and a P20 phosphor screen on an optical-fiber faceplate. The initial position, kinetic energy and angle distribution of the photoelectrons is sampled with Monte Carlo method. The electric field is calculated with finite difference formula, and the magnetic flux of the focus region is calculated with finite elements methods, and the electron trajectory is traced with Runge-Kutta method. We analysized the temporal and spatial distribution of 3000 electrons when they reached the prime plane and give out the temporal and spatial modulation transfer function of the femoto-diffraction system. |
| 文章类型 | Article |
| 关键词 | Femotosecond Electron Gun Finite Difference Method Monte-carlo Method Modulation Transfer Function |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 收录类别 | SCI ; EI |
| 语种 | 中文 |
| WOS研究方向 | Physics |
| WOS类目 | Physics, Multidisciplinary |
| WOS记录号 | WOS:000239068500029 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.opt.ac.cn/handle/181661/25156 |
| 专题 | 光电子学研究室 |
| 作者单位 | 1.Chinese Acad Sci, Xian Inst Opt & Precis Mech, Xian 710068, Peoples R China 2.Chinese Acad Sci, Inst Phys, Beijing 100080, Peoples R China |
| 推荐引用方式 GB/T 7714 | Tian Jin-Shou,Zhao Bao-Sheng,Wu Jian-Jun,et al. Theoretical calculation of the modulation transfer function in a femoto-second electron diffraction system[J]. ACTA PHYSICA SINICA,2006,55(7):3368-3374. |
| APA | Tian Jin-Shou,Zhao Bao-Sheng,Wu Jian-Jun,Zhao Wei,Liu Yun-Quan,&Zhang Jie.(2006).Theoretical calculation of the modulation transfer function in a femoto-second electron diffraction system.ACTA PHYSICA SINICA,55(7),3368-3374. |
| MLA | Tian Jin-Shou,et al."Theoretical calculation of the modulation transfer function in a femoto-second electron diffraction system".ACTA PHYSICA SINICA 55.7(2006):3368-3374. |
| 条目包含的文件 | ||||||
| 文件名称/大小 | 文献类型 | 版本类型 | 开放类型 | 使用许可 | ||
| 飞秒电子衍射系统中调制传递函数的理论计算（314KB） | 期刊论文 | 出版稿 | 限制开放 | CC BY-NC-SA | 请求全文 | |
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