三角形电极离子阱的理论模拟及性能优化  

Optimization of Linear Ion Trap Mass Analyzer with Triangular Electrodes by Simulation

作　　者：姚如娇 何洋[1] 肖育 丁正知 袁广洲 张在越 钱洁[1] 张曙光[1] 李晓旭[1] 

机构地区：[1]苏州大学机电工程学院,苏州215021 [2]上海卫星装备研究所,上海200240

出　　处：《分析化学》2016年第11期1793-1797,共5页Chinese Journal of Analytical Chemistry

基　　金：江苏省自然科学基金项目(BK20140340);苏州大学青年自然科学基金项目(SDY2013A11)资助~~

摘　　要：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 novel linear ion trap,the triangular-electrode linear ion trap（TeLIT）has simple structure and good performance. The relationship between its geometry and performance was investigated. Ion trajectories and mass peaks of TeLIT with different ratios of field radius（rx/ ry）were analyzed by using simulation software SIMION and AXSIM. It was shown that the performance of the TeLIT could be enhanced by optimizing rx/ rywhich would improve internal electric fields distribution. The optimum mass resolution of8387 was achieved for ions with m / z 1892 Th at rx/ ry= 5. 75 / 5 when scan rate was 1500 Th / s. When the scan rate was decreased to about 300 Th / s,the resolving power of the mass spectrum was in excess of 23000.

关 键 词：三角形电极离子阱 理论模拟 质量分辨率 电场优化 

分 类 号：TH843[机械工程—仪器科学与技术]