Collision energetics in a tandem time-of-flight (TOF/TOF) mass spectrometer with a curved-field reflectron
Collision energetics in a tandem time-of-flight (TOF/TOF) mass spectrometer with a curved-field reflectron
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DOI：
10.1016/j.ijms.2007.06.006
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发表时间：
2007-09-01
影响因子：
1.8
通讯作者：
Cotter, Robert J.
中科院分区：
文献类型：
--
作者：
Ilchenko, Serguei;Cotter, Robert J.
富勒烯离子（C-60（+））与氦和氖的碰撞在一个独特的串联飞行时间（TOF/TOF）质谱仪上进行，该质谱仪配备了弯曲场反射器（CFR）。CFR使得能够在宽的动能范围内聚焦产物离子。因此，从激光解吸/电离（LDI）源提取的离子在碰撞之前不减速，并且实验室坐标系中的碰撞能量由源提取电压确定。与惰性气体碰撞后获得的产物离子质谱的比较显示，相对于通过亚稳态解离（单分子衰变）获得的光谱中观察到的产物离子的时间（和表观质量）偏移，与脉冲碰撞模型一致，其中氦与富勒烯在高能量范围内的相互作用主要是与单个碳原子。此外，在较窄的动能范围内，对于碎片离子C50（+）、C52（+）、C54（+）、C56（+）和C58（+），观察到对应于氦捕获的附加峰。(c)2007 Elsevier B. V.保留所有权利。
Collisions of fullerene ions (C-60(+)) with helium and neon were carried out over a range of laboratory energies (3-20 keV) on a unique tandem time-of-flight (TOF/TOF) mass spectrometer equipped with a curved-field reflectron (CFR). The CFR enables focusing of product ions over a wide kinetic energy range. Thus, ions extracted from a laser desorption/ionization (LDI) source are not decelerated prior to collision, and collision energies in the laboratory frame are determined by the source extraction voltages. Comparison of product ion mass spectra obtained following collisions with inert gases show a time (and apparent mass) shift for product ions relative to those observed in spectra obtained by metastable dissociation (unimolecular decay), consistent with impulse collision models, in which interactions of helium with fullerene in the high energy range are primarily with a single carbon atom. In addition, within a narrow range of kinetic energies an additional peak corresponding to the capture of helium is observed for fragment ions C50(+), C52(+), C54(+), C56(+) and C58(+). (c) 2007 Elsevier B.V. All rights reserved.