新型三角形电极圆环离子阱的理论模拟研究

圆环离子阱由于其离子储存能力明显优于相同体积下的三维离子阱，近年来被认为是离子阱小型化发展的另一个重要方向。为进一步优化圆环形离子阱的质谱性能，特别是质量分辨能力，本研究提出了一种由三角形电极构建的新型圆环离子阱，它由两个完全等同的、截面为三角形的圆环电极及两个大小不等的圆筒型电极所组成，离子通过共振激发方式弹出。通过理论模拟和对电极结构的优化，获得了具有非对称性的三角形电极结构，通过改善圆环结构，优化电场分布，提高了离子引出效率和离子阱的质量分辨能力，其中一种最优化结构的圆环离子阱对m/z 609离子的质量分辨率达到1486。

Optimization of Performance of Toroidal Ion Trap with Triangular Electrode by Theoretical Simulation

The toroidal ion trap is an ideal candidate for miniaturized ion trap because it has much higher ion trapping capacity than a standard quadrupole ion trap of equal trapping dimensions. A novel toroidal ion trap mass analyzer with triangular electrode which contained a filament end cap, a detector endcap, an inner ring and an outer ring was reported. After designing and optimizing the electrodes by theoretical simulations, we found that the asymmetric triangle electrodes could reduce the affection from toroidal shape and improve the ion ejection rate and the mass resolution of the ion trap. The best design of the toroidal ion trap with a mass resolution of 1486 at m/z 609 was obtained.