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作为一种新型结构的线性离子阱,三角形电极离子阱(TeLIT)具有简单的电极结构与良好的分析性能。为进一步提高TeLIT的质谱性能,本研究考察了TeLIT的性能与电极结构的关系。利用模拟软件SIMION和AXSIM分析TeLIT场半径比与其内部电场分布的关系,并模拟离子运动轨迹,得出模拟离子质谱峰。理论模拟结果表明:优化场半径比可以改善内部电场分布,并能显著提高TeLIT的质量分辨率。最终模拟得出场半径比r_x/r_y=5.75∶5时为最优结构,在该结构下,m/z为1892 Th的离子在扫描速率为1500 Th/s时,质量分辨率可以达到8287;扫描速率降为300 Th/s时,最高质量分辨率可达23000。
As a new type of linear ion trap, the triangular electrode ion trap (TeLIT) has a simple electrode structure and good analytical performance. In order to further improve the mass spectral performance of TeLIT, this study examines the relationship between the properties of TeLITs and the electrode structure. The simulation software SIMION and AXSIM were used to analyze the relationship between the TeLIT field radius ratio and its internal electric field distribution and to simulate the ion trajectory to obtain the simulated ion mass peaks. Theoretical simulation results show that optimizing the field radius ratio can improve the internal electric field distribution and improve the quality resolution of TeLIT significantly. In the final simulation, the optimal structure is obtained when the field radius ratio r_x / r_y = 5.75: 5. Under this structure, the mass resolution of ions with 1892 Th m / z can reach 8287 at a scan rate of 1500 Th / When the rate is reduced to 300 Th / s, the highest quality resolution can reach 23,000.