Study of Molecular Science with a Table-top Synchrotron

对于使用较冷的环的原子物理，本研究的目标是更重的分子离子。用通常的磁储存环研究低电荷重分子离子的难点之一是磁刚性随离子质量的增加而增加。静电存储环更适合于这种离子，因为静电严格地与离子质量无关。然而，对于现有的静电环，观察到随着束流强度的增加，束流寿命大大降低。为了避免这种困难，我们建造了一个新的静电同步加速器，并证明了它可以以中等强度在足够长的寿命内存储原子和分子离子。为了研究生物分子离子在环中存储的可行性，用于原子碰撞实验，建立了一个用于将离子注入到存储环中的电喷雾离子源，需要一个高电流的脉冲束来进行…离子陷阱采用了线性射频陷阱，束束系统极大地提高了脉冲束流。为了对来自电喷射源的生物分子离子进行质量分析，建造了一台分辨率约为4000的质谱计，在环中储存了质量高达66000的正电荷生物分子离子，其中包括蛋白质。此外，还储存了负离子，这些电子束的寿命为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，导致与残余气体碰撞的存活时间很短。研究电子-离子碰撞，电子束靶是必不可少的。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一个电子束靶，就有可能研究生物分子离子的电子-离子碰撞过程。因此，这个环对生物学和物理学的研究都非常有吸引力。较少

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