质谱学报2018，Vol.39Issue(3)：316-322,7.DOI:10.7538/zpxb.2017.0074
非对称三角形电极离子阱的单向出射性能模拟研究
Research of Unidirectional Ion Ej ection in Triangular-Electrodes Ion Trap with Asymmetric Geometry
摘要
Abstract
The triangular-electrode linear ion trap (TeLIT)has simple structure and good performance.For existed TeLIT,ions were ej ected from both sides along the x axis,which meant that the ion detection efficiency would not be higher than 50% if only one ion detector was used,as it usually did.To solve this problem,two ion detectors were used in commercialized LIT mass spectrometer.However,this configuration requires relatively large vacuum chamber and higher cost,which is undesirable for developing miniaturized mass spectrometer.To improve ion detection efficiency without additional ion detector,a new type of TeLIT with asymmetric geometry was construc-ted.The two triangular electrodes on the ion ej ection direction (x axis)were built with different angles,which would introduce asymmetric electric fields in TeLIT and cause unidirectional ion ej ection.The relationship between electrode angle difference (Δα)and internal electric field distributions was calculated by numerical simulation method.At the same time,the ion traj ectories and simulated mass spectra were simulated by soft-ware SIMION and AXSIM,and then mass resolution and ion unidirectional efficiency were calculated.Ions (m/z 609,610 and 611)were used in the simulation,and the simulation results showed that,for m/z 610,a mass resolution of 2 647 and an ion unidirectional ej ection efficiency of over 9 5 % were achieved in TeLIT with Δαof 1 5°.So unidirectional ion ej ection could be realized without loss of mass resolution in an opti-mized TeLIT with asymmetric geometry,and it would significantly improve ion detection efficiency with only one ion detector,which made the asymmetric TeLIT pret-ty suitable for developing miniaturized mass spectrometer. Although only the performance of asymmetric TeLIT by simulation was investigated in this study,this simulation results would be helpful and instructional for further experiment and study.关键词
三角形电极离子阱(TeLIT)/非对称电场/三角电极角度差/离子单向出射/高阶电场Key words
triangular-electrode linear ion trap (TeLIT)/asymmetric electric fields/electrode angle difference (Δα)/unidirectional ion ej ection/nonlinear electric field分类
化学化工引用本文复制引用
吴海燕,张礼朋,袁广洲,张在越,钱洁,张曙光,李晓旭..非对称三角形电极离子阱的单向出射性能模拟研究[J].质谱学报,2018,39(3):316-322,7.基金项目
国家自然科学基金(61601314)资助 （61601314）
