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从理论上讲,离子阱质谱仪的性能是由阱内电场分布决定的,而电场分布又是由组成离子阱的电极几何结构和离子阱工作电压决定的.对于矩形离子阱,即使不考虑其几何结构的偏差,其阱内的电场分布一般也很复杂.在矩形离子阱内,除四极电场外,还包含多种成分的其他各种高阶场,它们直接影响离子在阱内的运动轨迹和离子阱质谱的性能.由于各种电场成分对离子阱内离子运动的影响非常复杂,还很难从数学上给出精确的解析解,使得目前从理论上还无法预测高阶场成分对质谱性能的影响.本工作通过测定不同几何结构的矩形离子阱的稳定图,从实验上比较了不同场半径,即不同电场分布条件下的离子阱质谱性能的差别.实验中,通过改变离子阱的几何比例结构,详细测定了不同结构的矩形离子阱的稳定图特征,并与实验测得的质谱分析结果进行比较.同时,我们还详细介绍了矩形离子阱质谱的稳定图的测定方法,并根据得到的不同情况下的稳定图结构分析了离子阱的质谱性能.研究结果表明:可以通过比较试验得到的稳定图结构来判断其离子阱质谱仪的性能如质量分辨能力等.此外,实验结果还发现:对于y方向拉伸结构的矩形离子阱,其实验绘制得到的是不完整的稳定图.但根据稳定图边界的特点,通过采用四极直流电压调制的方法,可以对y方向拉伸结构的矩形离子阱的性能进行改善,极大地提高了阱的质量分辨能力.
In theory, the performance of an ion trap mass spectrometer is determined by the electric field distribution within the well, which in turn is dictated by the electrode geometry and ion trap operating voltage that make up the ion trap. For rectangular ion traps, The deviation of the geometrical structure and the electric field distribution within the well are generally complex. In the rectangular ion trap, in addition to the quadrupole field, there are various other higher order fields of various compositions that directly influence the movement of ions in the well Trajectories and ion trap mass spectrometry. Since the influence of various electric field components on the ion motion within the ion trap is very complicated, it is difficult to give an accurate analytical solution mathematically, so that it is theoretically impossible to predict the high-order field component pairs Mass spectrometry.The influence of different field radius, that is, the difference of ion trap mass spectrometry performance under different electric field distributions, was experimentally compared by experimentally determining the stability plots of rectangular ion traps with different geometries.In this experiment, The geometrical scale structure of the rectangular ion trap with different structures was measured in detail and compared with the results of the experimentally measured mass spectrometry, and we also detailed The method of determining the stability of rectangular ion trap mass spectrometry was introduced and the mass spectra performance of the ion trap was analyzed according to the stable structure obtained under different conditions.The results show that the ion trap Mass spectrometer performance such as mass resolution, etc. In addition, the experimental results also found that: for the y-direction rectangular structure of the rectangular ion trap, the experimental drawing obtained is not stable, but according to the characteristics of the stability of the map boundary, by using The quadrupole DC voltage modulation method can improve the performance of the rectangular ion trap in the y-direction tensile structure and greatly improve the quality discrimination ability of the well.