title: Characterizing the transmission properties of an ion funnel.
abstract: 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.
authors: Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, Taiwan.
authors: E C
authors: EC
authors: Lynn
authors: M C
authors: MC
authors: Chung
authors: C C
authors: CC
authors: Han