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 C(50) (+), C(52) (+), C(54) (+), C(56) (+) and C(58) (+).

中文翻译：

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具有弯曲场反射器的串联飞行时间 (TOF/TOF) 质谱仪中的碰撞能量学

富勒烯离子 (C(60) (+)) 与氦和氖的碰撞是在配备有的独特串联飞行时间 (TOF/TOF) 质谱仪上在一系列实验室能量 (3-20 keV)弯曲场反射器 (CFR)。CFR 能够在很宽的动能范围内聚焦子离子。因此，从激光解吸/电离 (LDI) 源提取的离子在碰撞前不会减速，实验室框架中的碰撞能量由源提取电压决定。与惰性气体碰撞后获得的产物离子质谱图的比较显示，产物离子相对于通过亚稳态解离（单分子衰变）获得的质谱图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，在狭窄的动能范围内，观察到碎片离子 C(50) (+)、C(52) (+)、C(54) (+)、C( 56) (+) 和 C(58) (+)。