Study of multiple photoionization processes by multi-electron coincidence spectroscopy

多电子符合光谱研究多重光电离过程

• 批准号: 18540399
• 负责人: ITO Kenji
• 金额: $ 2.34万
• 依托单位: High Energy Accelerator Research Organization
• 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-18540399/
• 关键词: photoionization; multiple ionization; coincidence; time-of-flight; vacuum ultra violet; soft x-ray; 光電離過程; 多重電離過程; 真空紫外・軟X線

We have carried out multi-electron coincidence spectroscopy for investigating multiple photoionization processes of atoms and molecules. For this aim, it is very important to have a magnetic bottle time-of-flight electron spectrometer with high detection efficiency, and pulsed time structure of synchrotron radiation. For Ne atoms, we have obtained the final state-selective double photoionization cross sections for the incident photon energy region from the thresholds to 200eV, where the two electrons are ionized from the 2s and 2p outer shells. This is the first precise experimental data supplying an opportunity of rigorous examination for existing theories. In Xe atoms, the abnormal behavior of 4p photoelectron peaks has been paid attention since its first observation by Swedish group in 1976 ; the 4p_<1/2>peak is completely smeared out and the 4p_<3/2>peak is appeared as a complex structure. We have found an abnormal enhancement of 4d^2 double ionization, and analyzed precisely the e … More nergy correlation between these two electrons, which reveals that the Xe^<2+> 4d^<-2> states are produced via Super-Coster-Kronig processes of Xe+ 4p-1 states, which was predicted theoretically 30 years ago, and now proved experimentally with a new powerful coincidence spectOscopy. Furthermore, we have studied double photoionization of CO molecules, where an outer shell electron is simultaneously emitted with inner shell ionization of a C1s or O1ss electron. With coincidence measurements of these two electrons, we have found on the spectral features that the properties of the CO^<2+> states are characterized by the interaction between the localized valence holes and the core holes.These results have been reported in the academic journals and presented at the internal and international conferences as shown in the next pages. While so far we have been interested in double photoionization processes where two electrons makes important roles, we will develop our study three electrons processes, using a mechanical light chopper accomplished with an aid of this grant. Actually, we have already obtained interesting results on Ar triple ionization, which will be submitted to a journal very soon. Less

我们进行了多电子重合光谱，以研究原子和分子的多个光电离过程。为此，拥有具有高检测效率的磁性瓶飞机电子光谱仪以及同步加速器辐射的脉冲时间结构非常重要。对于NE原子，我们已经获得了从阈值到200EV的入射光子能区域的最终状态选择性双光电离截面，其中两个电子从2s和2p外壳电离。这是第一个精确的实验数据，为现有理论提供了严格检查的机会。在Xe原子中，自1976年瑞典群体第一次观察以来，4p光电子峰的异常行为已引起人们的注意。 4P_ <1/2>峰被完全涂抹，而4p_ <3/2>峰出现为复杂的结构。我们发现4D^2双电离的异常增强，并精确地分析了这两个电子之间的e…更加内在的相关性，这表明Xe^<2+> 4D^<-2>状态通过XE+ 4p-1 States的Super-Coster-Kronig过程产生，这是XE+ 4p-1 States的XE+ 4P-1状态，该状态是30年代的启示，并且是一个启用了实验。此外，我们研究了CO分子的双光电离，其中外壳电子简单地用C1S或O1SS电子的内壳电离发射。通过对这两个电子的巧合测量，我们在光谱特征上发现，co <2+>状态的性质的特征是局部价孔与核心孔之间的相互作用。这些结果已在学术期刊上报道，并在下一页所示的内部和国际会议上介绍。虽然到目前为止，我们对两个电子发挥重要作用的双光电离过程感兴趣，但我们将使用借助这笔赠款的机械轻斩波器来开发研究三个电子工艺。实际上，我们已经在AR三重电离上获得了有趣的结果，这将很快提交给期刊。

项目成果

Autoionization of Ne^+^ Rydberg states formed through valence photoemission

通过价态光电子发射形成 Ne^ ^ Rydberg 态的自电离

• 发表时间: 2007
• 期刊: J. Phys. B40
• 作者: T. Kaneyasu;Y. Hikosaka;E. Shigemasa;F. Penent;P. Lablanquie;T. Aoto;K. Ito
• 通讯作者: K. Ito

Autoionization of Ne^+ Rydberg states formed via valence photoemission

通过价光电子发射形成 Ne^ Rydberg 态的自电离

• 发表时间: 2007
• 期刊: Journal of Physics B 40
• 作者: T. Kaneyasu;Y. Hikosaka;E. Shigemasa;F. Penent;P. Lablanquie;T. Aoto and K. Ito
• 通讯作者: T. Aoto and K. Ito

Multiple ionization of atoms with multi coincidence spectroscopy

用多重符合光谱进行原子的多重电离

• 发表时间: 2008
• 作者: Hikosaka;Kaneyasu;Shigemasa;Lablanquie;Penent;Eland;Ito
• 通讯作者: Ito

State-selective cross sections of multiple photoionization in Ne

• DOI: 10.1103/physreva.76.012717
• 发表时间: 2007-07
• 期刊: Physical Review A
• 影响因子: 2.9
• 作者: T. Kaneyasu;Y. Hikosaka;E. Shigemasa;F. Penent;P. Lablanquie;T. Aoto;K. Ito

Double photoionization into doule core-hole states of Xe

双光电离形成 Xe 的双核空穴态

• 发表时间: 2007
• 期刊: Physical Review Letters 98
• 作者: T. Kaneyasu;Y. Hikosaka;E. Shigemasa;F. Penent;P. Lablanquie;T. Aoto;K. Ito;Y.Hikosaka
• 通讯作者: Y.Hikosaka