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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Mapping the Distribution of Ion Positions as a Function of Quadrupole Ion Trap Mass Spectrometer Operating Parameters to Optimize Infrared Multiphoton Dissociation
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Mapping the Distribution of Ion Positions as a Function of Quadrupole Ion Trap Mass Spectrometer Operating Parameters to Optimize Infrared Multiphoton Dissociation

机译：映射离子位置的分布作为四极杆离子阱质谱仪操作参数的函数，以优化红外多光子解离

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摘要

Infrared multiphoton dissociation (IRMPD) combined with ion trajectory simulations has been used to obtain probability maps of ion position as a function of different operating parameters in a quadrupole ion trap mass spectrometer. The factors that contribute to the depth of the pseudopotential trapping well are analyzed, and their effects on the efficiency of IRMPD are demonstrated. Ion trajectory simulations are used to substantiate experimental results and demonstrate in greater detail the dynamic nature of the ion population’s positional distribution. In particular, it is shown that the so-called “qz value” used during photodissociation can be of great consequence, as can the frequency of ac trapping voltage applied to the ring electrode. The results reveal that parameters which increase the pseudopotential well have the effect of decreasing the size of the ion cloud and maximizing overlap between the irradiating laser and the ions. Thus, while the common understanding of IRMPD dictates otherwise, IRMPD fragmentation efficiencies really depend on many ion trap operating parameters, much as collision-induced dissociation does.
机译：红外多光子解离（IRMPD）与离子轨迹模拟相结合已被用于获得四极杆离子阱质谱仪中不同操作参数的离子位置概率图。分析了影响伪电位阱深度的因素，并证明了它们对IRMPD效率的影响。离子轨迹模拟可用于证实实验结果，并更详细地说明离子种群位置分布的动态性质。特别地，示出了在光离解期间使用的所谓的“ qz值”可能是非常重要的，施加到环形电极上的交流陷波电压的频率也可以如此。结果表明，增加伪势阱的参数具有减小离子云的大小和最大化照射激光与离子之间的重叠的效果。因此，尽管对IRMPD的普遍理解另有规定，但IRMPD裂解效率实际上取决于许多离子阱操作参数，就像碰撞诱导的解离一样。

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