STUDY OF ATOM MOLECULE COLLISIONS WITH ELECTROSTATIC ION STRAGE RING

静电离子存储环原子分子碰撞研究

基本信息

批准号：
14340124
负责人：
KOBAYASHI Nobuo
金额：
$ 9.47万
依托单位：
Tokyo Metropolitan University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14340124/
关键词：
Ion strage ring Atom.molecule collision electrostatic ring

项目摘要

Electrostatic ion storage rings have various advantages : 1)they can store very heavy ions, i.e., not only polyatomic molecular ions, but also cluster, DNA, and amino acid ions, which have not been previously dealt with as beams, 2)they can cool the vibrationally excited states of the molecular ions by emitting radiation during storage, and 3)their practical beam intensity is high due to circulation of beams compared with the traditional one-pass experiment, and they are suitable to merging experiments with electron, neutral and laser beams. By developing the electrostatic ion storage ring and merging experiments with other beams, we aimed to investigate a brand new field in atomic collision like lifetime of excited state of biomolecular ions or their interaction with electron, neutral, positive/negative ion, laser etc..In 2002, we constructed the ring with circumstance of about 8 m and the inside of the ring was kept in a good vacuum of 10^<-11> Torr order. Furthermore, we succeeded in cooling the ring itself down to the liquid nitrogen temperature, which is one of the most important characters of our ring. In 2003, we developed a Duoplasma-type ion source providing positive and negative ions, and prepared both a mass analyser to select ion species and a pulsed ion injection system. In addition we made a neutral product detector placed on the extension of the straight-line section, and a non-destructive beam monitor picking up the induced charge by the beam. We recently succeeded in the circulation of the heavy rare gas ions more than 1000 turns. Soon after tuning of the best operation parameters, we plan to storage molecular ions, and measure its temperature dependence of lifetime and vibrational spectroscopy using a tunable laser.

静电离子存储环具有多种优点：1）它们可以存储非常重的离子，即不仅可以存储多原子分子离子，还可以存储簇离子、DNA 和氨基酸离子，这些离子以前没有被处理为束流，2）它们可以存储在储存过程中通过发射辐射来冷却分子离子的振动激发态，3）与传统的单程实验相比，由于束流循环，其实际束流强度高，适合合并电子束、中性束和激光束的实验。通过开发静电离子存储环以及与其他光束的合并实验，我们旨在研究原子碰撞中的一个全新领域，例如生物分子离子激发态的寿命或其与电子、中性、正/负离子、激光等的相互作用。 2002年，我们建造了约8m环境的环，环内保持10^<-11>Torr量级的良好真空。此外，我们成功地将环本身冷却到液氮温度，这是我们环最重要的特征之一。 2003年，我们开发了提供正离子和负离子的双等离子体型离子源，并准备了用于选择离子种类的质量分析器和脉冲离子注入系统。此外，我们还制作了一个放置在直线部分延长线上的中性产品探测器，以及一个拾取光束感应电荷的无损光束监视器。我们最近成功地实现了重稀有气体离子的循环超过1000转。在调整最佳操作参数后不久，我们计划存储分子离子，并使用可调谐激光器测量其寿命和振动光谱的温度依赖性。