Development of the Cold Collision Electron Spectroscopy

冷碰撞电子能谱的发展

• 批准号: 18540390
• 负责人: KITAJIMA Masashi
• 金额: $ 2.39万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2006
• 资助国家: 日本
• 起止时间: 2006 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18540390/
• 关键词: Low energy electron collision; Synchrotron Radiation; Threshold electron; Electron scattering; Cold Collision

The scattering of very low energy electrons by atomic and molecular targets are expected to be strongly dominated by quantum effects involving phenomena such as quantum interference and revealing new and unexpected behavior. Recently, experimental technique for measuring the total cross section of the electron molecule collisions at very low energy of below a few hundred meV was developed. Mono-energetic photoelectrons produced in the near-threshold photoionization of atoms by monochromatized Synchrotron Radiation (SR) were used as a source in their technique. This technique made it possible to produce very low energy electron beam, even below the energy of〜40 meV, which corresponds to the room temperature. In their setup, however, the energy width of the electron beam depends on the spot size and the band width of the monochromatized SR, which are trade-off between the photon flux of the excitation photon beam. Therefore, highly brilliant incident photon beam was necessary. In the present research, we developed a new experimental technique Cold Collision experiment utilizing the SR with much highly efficiency.The key of the present technique is to use the penetration field to correct only the "0" energy photoelectrons, instead of applying the constant filed across the photoionization region. Under high resolution photon beam conditions, threshold peaks are asymmetric, characterized by a sharp rise and a more slow fall off in the high energy side. The slow fall off corresponds to energetic or 'hot' electrons that are emitted from the interaction region directly into the electron lens. The high energy tail can be reduced by appropriate potentials in the second stage of the optics. We successfully obtained the total electron scattering cross sections of Xe by the beam attenuation method with our new setup.

原子和分子目标对极低能量电子的散射预计将受到量子效应的强烈影响，量子效应涉及量子干涉等现象，并揭示新的和意想不到的行为。最近，发展了一种测量几百meV以下极低能量下电子分子碰撞总截面的实验技术。在他们的技术中，单色化同步辐射（SR）在近阈值光电离原子时产生的单能光电子被用作源。这种技术使得产生非常低能量的电子束成为可能，甚至低于相当于室温的1040 meV的能量。然而，在他们的设置中，电子束的能量宽度取决于单色化SR的光斑尺寸和带宽，这是激发光子束的光子通量之间的权衡。因此，高亮度的入射光子束是必要的。本研究中，我们发展了一种新的实验技术--冷碰撞实验，该技术的关键是利用穿透场只校正“0”能光电子，而不是在整个光电离区施加恒定场。在高分辨率光子束条件下，阈值峰是不对称的，其特征在于在高能量侧急剧上升和更缓慢的下降。缓慢下降对应于从相互作用区域直接发射到电子透镜中的高能或“热”电子。通过在第二级光学系统中引入适当的电势，可以减小高能拖尾。我们用束流衰减法成功地测量了电子在电子束中的总散射截面。

项目成果

Development of the new setup for the experiment on Cold Electron Collision utilizing threshold photoelectrons

利用阈值光电子开发冷电子碰撞实验新装置

• 发表时间: 2007
• 作者: Manabu Kurokawa;Akira Sato;Masashi Kitajima;Hirotomo Kawahara;Hidetoshi Kato;Masasmitsu Hoshino;Takeshi Odagiri;Hiroshi Tanaka;and Kenji Ito
• 通讯作者: and Kenji Ito

A new experimental technique for the cold electron collision utilizing Synchrotron Radiation

利用同步辐射的冷电子碰撞新实验技术

• 发表时间: 2007
• 期刊: Photon Factory Activity Report 2006 24-B
• 作者: K. Harada;T. Kanbashi;M. Mitsunaga;and K. Motomura;北島昌史
• 通讯作者: 北島昌史

しきい光電子を用いたCold Electron Collision実験装置の開発

阈值光电子冷电子碰撞实验装置研制

• 发表时间: 2007
• 作者: 北島昌史;黒川 学;佐藤 祥;河原弘朋;加藤英俊;星野正光;田中 大;伊藤健二;光永 正治;黒川 学
• 通讯作者: 黒川 学

A new experimental technique for the electron collision at very low energy utilizing threshold photoelectrons

利用阈值光电子进行极低能量电子碰撞的新实验技术

• 发表时间: 2008
• 作者: Manabu Kurokawa;Masashi Kitajima;Takeshi Odagiri;Hirotomo Kawahara,Hidetoshi Kato;Masasmitsu Hoshino;Hiroshi Tanaka;and Kenji Ito
• 通讯作者: and Kenji Ito

Present status of the experimental setup for experiment on the Cold Collision utilizing threshold photoelectrons

阈值光电子冷碰撞实验装置现状

• 发表时间: 2008
• 作者: Manabu Kurokawa;Masashi Kitajima;Takeshi Odagiri;Hirotomo Kawahara;Hidetoshi Kato;Masasmitsu Hoshino;Hiroshi Tanaka;and Kenji Ito
• 通讯作者: and Kenji Ito