Lynn E C, Chung M C, Han C C
Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, Taiwan.
Rapid Commun Mass Spectrom. 2000;14(22):2129-34. doi: 10.1002/1097-0231(20001130)14:22<2129::AID-RCM144>3.0.CO;2-M.
The characteristic features of ion transmission properties in a radio-frequency (RF) electric-field driven ion funnel using the SIMION ion trajectory simulation package is presented. A user program applying the Douglas ion-neutral collisional drag coefficient model is incorporated to properly account for the ion focusing and transport effect of the background gas under the effect of the driving RF and a superimposed DC field. The simulated m/z transmission window compares favorably with the experimental results reported by Smith et al. RF amplitude and pressure dependence of experimentally observed m/z transmission windows are also examined, and an approximated effective potential model based on Gerlich's equation is proposed to interpret the low-m/z cutoff behavior. A modified ion funnel configuration is described.
介绍了使用SIMION离子轨迹模拟软件包在射频（RF）电场驱动离子漏斗中离子传输特性的特征。纳入了一个应用道格拉斯离子-中性碰撞拖曳系数模型的用户程序，以适当考虑背景气体在驱动RF和叠加直流电场作用下的离子聚焦和传输效应。模拟的质荷比（m/z）传输窗口与史密斯等人报道的实验结果相比具有优势。还研究了实验观察到的m/z传输窗口对RF振幅和压力的依赖性，并提出了一个基于格尔利希方程的近似有效势模型来解释低m/z截止行为。描述了一种改进的离子漏斗配置。
