Study of Molecular Science with a Table-top Synchrotron

使用台式同步加速器进行分子科学研究

• 批准号: 11304017
• 负责人: TANABE Tetsumi
• 金额: $ 24.81万
• 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 (A)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11304017/
• 关键词: Storage ring; Electrostatic ring; Ultra-high vacuum; Electrospray ion source; Mass spectrometer; Bio-molecularion; Electron beam target; Atomic collision; 大気圧イオン源; 質量分析; 原子・分子

For atomic physics using cooler rings, the object of the present research is being directed to heavier molecular ions. One of the difficulties in studying low-charge and heavy molecular ions with the usual magnetic storage rings is in the increasing magnetic rigidity with ion mass. An electrostatic storage ring is more suitable to such ions because the electrostatic rigidly is independent of the ion mass. However, it was observed that the beam lifetime decreased greatly with increasing beam intensity for an existing electrostatic ring. In order to avoid such a difficulty, we constructed a new electrostatic synchrotron and showed that it can store atomic and molecular ions at sufficiently long lifetimes with moderate intensities. In order to study the feasibility of storing bio-molecular ions in the ring, for use in atomic-collision experiments, an electrospray ion (ES1) source was constructed For injecting ions into the storage ring, a high current pulse beam is required In order to st … More ack the beam, a linear RF trap was adopted The ion trap and the beam bunding system dramatically increased the pulse beam current. In order to mass-analyze bio-molecular ions from the ESI source, a mass spectrometer with a resolving power of about 4000 was constructed singly or multiply charged positive bio-molecular ions up to a mass of about 66, 000 including proteins were stored in the ring. Furthermore, a negative ion was also stored The beams have lifetimes of 12 s - 20 s, which are surprisingly long because large bio-molecules have usually been assumed to be fragile, resulting in a short surviving time in collisions with residual gas. An electron-beam target is indispensable for studying electron-ion collisions. An electron-beam target, which is also a compact electron cooler, has been designed. If we introduce an electron beam target into the ring, it will be possible to study electron-ion collision processes for bio-molecular ions. Thus, the ring is very attractive for studies in both biology and physics. Less

对于使用较冷环的原子物理学，目前研究的对象是更重的分子离子。用通常的磁性储存环研究低电荷重分子离子的困难之一是磁刚度随离子质量的增加而增加。静电储存环更适合于这种离子，因为静电刚性与离子质量无关。然而，有人观察到，随着现有的静电环的束流强度的增加，束流寿命大大降低。为了避免这样的困难，我们构建了一个新的静电同步加速器，并表明它可以存储原子和分子离子在足够长的寿命与中等强度。为了研究在储存环中储存生物分子离子的可行性，并用于原子碰撞实验，我们研制了一台电喷雾离子源（ES 1）。 ...更多信息 在束流后，采用了线性射频离子阱，离子阱和束流束为了对来自ESI源的生物分子离子进行质量分析，构建了分辨率约为4000的质谱仪，将包括蛋白质在内的质量高达约66，000的单电荷或多电荷正生物分子离子存储在环中。此外，还存储了负离子。光束的寿命为12 s - 20 s，这是令人惊讶的长，因为大的生物分子通常被认为是脆弱的，导致与残留气体碰撞的存活时间很短。电子束靶是研究电子-离子碰撞所不可缺少的。设计了一种电子束靶，它也是一种紧凑型电子冷却器。如果我们在环中引入电子束靶，将有可能研究生物分子离子的电子-离子碰撞过程。因此，该环对于生物学和物理学的研究都非常有吸引力。少

项目成果

T.Tanabe: "Storage of Bio-Molecular Ions in an Electrostatic Storage Ring"Proceedings of the 13th Symposium on Accelerator Science and Technology. 155-159 (2001)

T.Tanabe：“静电存储环中生物分子离子的存储”第十三届加速器科学与技术研讨会论文集。

T.Tanabe: "An Electrostatic Storage Ring for Studying Electron-Ion Collisions at KEK"Proceedings of the International Symposium on the Dissociative Recombination of Molecules with Electrons. (2002)

T.Tanabe：“用于在 KEK 研究电子-离子碰撞的静电存储环”国际分子与电子解离重组研讨会论文集。

T.Tanabe,K.Chida,K.Noda,I.Watanabe: "An Electrostatic Storage Ring for Molecular Science"Proceedings of the 7th European Particle Accelerator Conference. 797-799 (2000)

T.Tanabe、K.Chida、K.Noda、I.Watanabe：“分子科学的静电存储环”第七届欧洲粒子加速器会议论文集。

Tetsumi Tanabe: "An Electron Target/Cooler for Extremely Low-Energy Ion Beams at the Electrostatic Storage Ring"Proceedings of the Workshop on Ion Beam Cooling-toward the Crystalline Beam, Kyoto, 2001. (2002)

Tetsumi Tanabe：“静电存储环处的极低能量离子束的电子靶/冷却器”离子束冷却研讨会论文集 - 朝向晶体束，京都，2001 年。（2002 年）

Tetsumi Tanabe: "An Electrostatic Storage Ring for Studying Electron-Ion Collisions at KEK"Proceedings of the International Symposium on the Dissociative Recombination of Molecules with Electrons, Chicago, 2001, Kluwer Academic/Plenum. (2002)

Tetsumi Tanabe：“用于在 KEK 研究电子-离子碰撞的静电存储环”国际分子与电子解离重组研讨会论文集，芝加哥，2001 年，Kluwer 学术/全会。