印刷线路板分压离子阱的离子单向出射性能研究

发布时间：2018-04-14 04:34

本文选题：印刷线路板分压离子阱 + 理论模拟　；参考：《分析化学》2017年02期

【摘要】：印刷线路板(Printed-Circuit-Board,PCB)分压离子阱是一种新型质量分析器,其突出优点在于内部电场可通过调节射频分压比进行优化。本实验在PCB分压离子阱离子出射方向的两组离散电极上配置了非对称的射频分压,以引入奇次阶场成分,使得射频电场的场中心(即离子运动中心)发生偏移,从而实现离子单向出射。通过数值计算软件SIMION和AXSIM分析了射频分压比差值与其内部电场分布的关系,并模拟离子运动轨迹,得到离子出射情况和模拟质谱峰。模拟结果表明,当两组离散电极的射频分压比差值为20%时,在合适的AC频率条件下,对于m/z=609 Th的离子,PCB分压离子阱的离子单向出射率可达90%以上,且质量分辨率大于2500。本研究可使PCB分压离子阱在基本不损失质量分辨率和使用单检测器模式下,大幅提高离子检测效率,因而在小型化质谱仪应用中具有显著优势。
[Abstract]:Printed-Circuit-Board-PCB (PCB) is a new type of mass analyser. Its outstanding advantage is that the internal electric field can be optimized by adjusting the RF voltage fraction.In this experiment, asymmetric RF partial voltage is arranged on two groups of discrete electrodes in the direction of ion ejection in PCB partial pressure ion trap to introduce odd-order field components, which makes the field center of RF electric field (that is the center of ion motion) to shift.Thus, the ion emission is realized in one direction.The relationship between the difference of radio frequency partial pressure ratio and the distribution of internal electric field is analyzed by numerical calculation software SIMION and AXSIM. The ion movement trajectory is simulated and the ion ejection and the simulated mass spectrum peak are obtained.The simulation results show that when the radio frequency partial voltage ratio difference between the two groups of discrete electrodes is 20, under the appropriate AC frequency, the ion one-way emission rate of the m/z=609 Th ion trap can reach more than 90%, and the mass resolution is more than 2500.In this study, the PCB partial pressure ion trap can greatly improve the efficiency of ion detection under the condition of no loss of mass resolution and the use of single detector mode, so it has significant advantages in the application of miniaturized mass spectrometers.
【作者单位】：苏州大学机电工程学院;复旦大学化学系;
【基金】：国家自然科学基金项目(No.61601314)资助~~
【分类号】：TN41

【相似文献】