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首页> 外文期刊>The European physical journal, D. Atomic, molecular, and optical physics >Energetics and dynamics of decaying cluster ions
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Energetics and dynamics of decaying cluster ions

机译：衰变簇离子的能量学和动力学

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The recent addition of (i) a third sector field to our two sector field mass spectrometer (resulting in a BE1E2 field configuration) and of (ii) a high performance electron gun enables us now to study in detail the time dependence of the kinetic energy release distribution (KERD) over a relatively wide range of cluster ion lifetimes. Using this newly constructed device we have studied here for the first time KERDs and deduced binding energies BEs (using finite heat bath theory) of large rare gas cluster ions (an upper size limit in earlier studies arose from the fact that different naturally occurring isotopes will contribute to a chosen metastable peak when the size exceeds a certain value) and in addition of fullerene ions smaller and larger than C_(60)~+ (here again contaminating coincidences did not allow such studies earlier). Moreover, high precision KERD measurements for the decay of rare gas dimer ions in conjunction with model calculations (using recently calculated potential energy curves for the rare gas dimer ions) also enable us to obtain information on the dynamics and the mechanisms of the underlying spontaneous decay reactions Rg_2~(+*) → Rg~+ + Rg. In addition, we are also reporting here a novel method (unified breakdown graph method) to determine cluster ion binding energies using a recently constructed tandem mass spectrometer BESTOF allowing us to measure fragmentation patterns arising from the unimolecular decay of molecular cluster ions induced by surface collisions. The fragmentation and reaction patterns of protonated ethanol cluster ions investigated here clearly demonstrate in contrast to some of the earlier cluster ion studies that unimolecular dissociation kinetics determines the formation of product ions in the surface-induced decomposition.
机译：（i）在我们的两扇区场质谱仪中增加了（i）第三扇区场（产生BE1E2场配置）和（ii）高性能电子枪，这使我们现在可以详细研究动能的时间依赖性相对较宽的簇离子寿命范围内的释放分布（KERD）。使用这种新构建的装置，我们首次在这里研究了KERDs和推导的大型稀有气体簇离子的结合能BEs（使用有限的热浴理论）（早期研究的上限是由于不同的天然同位素会当大小超过一定值时，会导致选定的亚稳态峰），此外还会添加小于和大于C_（60）〜+的富勒烯离子（此处再次出现的污染巧合不允许更早进行此类研究）。此外，用于稀有气体二聚体离子衰减的高精度KERD测量与模型计算（使用最近计算的稀有气体二聚体离子的势能曲线）相结合，还使我们能够获得有关潜在自发衰减的动力学和机理的信息反应Rg_2〜（+ *）→Rg〜+ + Rg。此外，我们还在此报告一种新方法（统一分解图方法），该方法使用最近构造的串联质谱仪BESTOF确定簇离子的结合能，使我们能够测量由于表面碰撞引起的分子簇离子的单分子衰减而产生的碎片模式。与一些较早的簇离子研究相反，质子化乙醇簇离子的碎片和反应模式清楚地证明了单分子解离动力学决定了表面诱导的分解过程中产物离子的形成。

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