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首页> 外文期刊>Rapid Communications in Mass Spectrometry: RCM >On the high-resolution mass analysis of the product ions in tandem time-of-flight (TOF/TOF) mass spectrometers using a time-dependent re-acceleration technique
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On the high-resolution mass analysis of the product ions in tandem time-of-flight (TOF/TOF) mass spectrometers using a time-dependent re-acceleration technique

机译：使用依赖于时间的重新加速技术在串联飞行时间（TOF / TOF）质谱仪中对产物离子进行高分辨率质量分析

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摘要

The time-dependent reacceleration of product ions produced as a result of dissociation of a single precursor ion in a tandem time-of-flight mass spectrometer is considered for the first time. Analytical expressions for the shapes of electric pulses bringing all the kinetic energies of the product ions to the same value are derived for two cases: forward acceleration mode and deceleration, followed by reacceleration in the reversed direction (reversed mode). Secondary time-of-flight focusing resulting from the re-acceleration in the reversed mode is shown to be mass-dependent and, when averaged over a wide mass range, the focusing is tight enough to provide mass resolution exceeding 10 000. After time-dependent re-acceleration, additional compression of the ion packet width leading to better mass resolution can be obtained by decelerating the ions in a constant field.
机译：首次考虑了串联飞行时间质谱仪中单个前体离子解离产生的产物离子随时间的重新加速。在以下两种情况下得出了使产物离子的所有动能达到相同值的电脉冲形状的解析表达式：正向加速模式和减速，然后沿反向反向加速（反向模式）。反向模式下重新加速产生的二次飞行时间聚焦与质量有关，当在较宽的质量范围内平均时，聚焦足够紧密，可以提供超过10000的质量分辨率。取决于重新加速，可以通过在恒定磁场中使离子减速来获得对离子包宽度的额外压缩，从而获得更好的质量分辨率。

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