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Development of a SIMION-Simulated Ion Funnel Tube for Proton Transfer Reaction Mass Spectrometry
Authors:Hui ZHU  Gao-Sheng ZHAO  Li XU  Zhen PENG  Biao FENG  Jun-Guo DONG  Ping CHENG  Zhen ZHOU
Institution:1. School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China;2. School of Physics & Electronic Engineering, Fuyang Normal University, Fuyang 236037, China;3. Institute of Atmosphere environment security and Pollution control, Jinan University, Guangzhou 510632, China
Abstract:Because the optimum working pressure of ion funnel (IF) is very close to the typical operating pressure of a traditional drift tube for proton transfer reaction mass spectrometry (PTR-MS), it is possible to develop an IF drift tube for PTR-MS to improve the sensitivity. In this study, an ion funnel capable of functioning as a drift tube in a PTR-MS system was designed and studied by computer simulation. To optimize the geometrical and electrical parameters of the ion funnel, five ion funnel configurations were constructed. The merits and features of the respective ion funnels were evaluated, and the ion transmission characteristics were investigated and analyzed. An optimized ion funnel model was compared against the typical traditional drift tube that was used in PTR-MS for ion transmission, and it was found that the ion traveling trajectories in the ion funnel and traditional drift tube had different shapes and ion transmission efficiencies. Preliminary investigations revealed that this ion funnel improved the ion transmission efficiency by at least 10 times. The simulation and experiment results are helpful in guiding the design of an improved ion funnel to develop a PTR-MS system with higher sensitivity.
Keywords:Ion funnel  Drift tube  Computer simulation  SIMION software  Proton transfer reaction mass spectrometer
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