Momentum imaging spectroscopy of fragment ions produced in highly charged ion - molecule collisions controlled by the heat of formation

由形成热控制的高电荷离子-分子碰撞中产生的碎片离子的动量成像光谱

• 批准号: 12640386
• 负责人: MOTOHASHI Kenji
• 金额: $ 2.37万
• 依托单位: Tokyo University of Agriculture and Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12640386/
• 关键词: MULTIPLY-CHARGEDION; ELECTRON TRANSFER; FRAGMENTATION; MOMENTUM; IMAGING SPECTROSCOPY; THE HEAT OF REACTION; THE COULOMBEXPLOSION; 分子; 働突; 画像分光

The most important purpose of this research is developing of an experimental technique to identify the correlation between an intermediate state and following fragmentation processes in collisions between highly charged ion and molecule. In order to investigate fragmentation processes induced by electron transfer between ion and molecule, it is necessary to specify an intermediate state of molecule produced just after the collision. No information about the intermediate state, however, had been obtained because only charge-state change of incident ion had been selected until now. In this research, we developed a hew spectroscopic device which is able to measure not only charge-state change but also kinetic energy change in coincidence with 3D-momentum image of fragment ions. This research also includes development of a compact ion source producing highly charged ions without any cooling system.In the first term of this project (2000), a compact multiply-charged ion source was developed … More , and a related paper was published. The size of the ion source is very small (40 cm long and 20 cm diameter) and the power consumption is very low (4 W). Extraction of Ne^<10+>, Ar^<18+>, and Kr^<29+> was succeeded from the ion source by using a pair of NdFeB permanent magnets and special shaped yokes.In the last term of this project (2001), the SD-momentum imaging analyzer was developed. We participated in some conferences and published the proceedings. It is possible to measure not only charge-state change but also kinetic energy change in coincidence with SD-momentum image of fragment ions by using this analyzer. This device makes it possible to assign both electronic states of incident ion and target molecule just after the electron transfer collision. It was possible to specify the electronic states of molecules in collisions between Ar^<q+> (q=3, 8, 9, 11, and 12) and N_2, CH_4, and CF_4 molecules for the first time. In addition, some information on molecular orientation and asymmetry of fragmentation were obtained from the results. Less

本研究的最重要目的是发展一种实验技术，以确定高电荷离子与分子碰撞中中间态与随后的碎裂过程之间的相关性。为了研究离子与分子间电子转移引起的碎裂过程，需要确定碰撞后分子的一个中间态。然而，由于迄今为止只选择了入射离子的电荷态变化，因此没有获得关于中间态的信息。在本研究中，我们发展了一种新的光谱装置，它不仅能够测量电荷状态的变化，而且还能测量碎片离子的动能变化，与碎片离子的三维动量图像一致。本研究亦包括发展一个不需任何冷却系统而可产生高电荷态离子的小型离子源。在本计画的第一期（2000年），我们已发展出一个小型多电荷态离子源 ...更多信息 并发表了一篇相关论文。离子源的尺寸非常小（40厘米长，直径20厘米），功耗非常低（4 W）。利用一对NdFeB永磁体和特殊形状的磁轭，成功地从离子源中提取了Ne^<10+>、Ar^<18+>和Kr^<29+>。我们参加了一些会议并出版了会议记录。利用该分析仪不仅可以测量碎片离子的电荷态变化，而且还可以测量碎片离子的动能变化。该装置可以在电子转移碰撞后立即指定入射离子和目标分子的电子态。首次确定了Ar^<q+>（q= 3，8，9，11，12）与N_2，CH_4和CF_4分子碰撞时分子的电子态。此外，还得到了分子取向和不对称断裂的一些信息。少

项目成果

Kenji Motohashi: "CORRELATIONS, POLARIZATION, AND IONIZATION IN ATOMIC SYSTEMS"American Institute of Physics. 325 (2002)

Kenji Motohashi：“原子系统中的相关性、极化和电离”美国物理研究所。

Kenji Motohashi: "Compact electron-beam ion trap using NdFeB permanent magnets"Review of Scientific Instruments. 71・(2). 890-892 (2000)

Kenji Motohashi：“使用 NdFeB 永磁体的紧凑型电子束离子阱”科学仪器评论 71・(2) (2000)。

Kenji Motohashi: "Compact electron-beam ion trap using NdFeB permanent magnets"Review of Scientific Instruments. 71. 890-892 (2000)

Kenji Motohashi：“使用 NdFeB 永磁体的紧凑型电子束离子阱”科学仪器评论。

Kenji Motohashi, Akihiko Moriya, Hiroyuki Yamada, Seiji Tsurubuchi: "Compact electron-beam ion trap using NdFeB permanent magnets"Review of Scientific Instruments. 71. 890-892 (2000)

Kenji Motohashi、Akihiko Moriya、Hiroyuki Yamada、Seiji Tsurubuchi：“使用 NdFeB 永磁体的紧凑型电子束离子阱”科学仪器评论。

Kenji Motohashi and Seiji Tsurubuchi: "Momentum Distribution of Fragment Ions Produced in Collisions of Ar^<q+> with and CH_4 and CF_4"

Kenji Motohashi 和 Seiji Tsurubuchi：“Ar^<q > 与 CH_4 和 CF_4 碰撞时产生的碎片离子的动量分布”