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

Abstract

As a novel linear ion trap, the triangular-electrode linear ion trap (TeLIT) has simple structure and good analysis capacity. To enhance the analysis capacity of TeLIT, the relationship between its geometry and performance was investigated, and the ion trajectories and mass peaks of TeLIT with different ratio of field radius (rx/ry) was analyzed using simulation software SIMION and AXSIM. The results showed that the analytical performance of the TeLIT could be enhanced by optimizing rx/ry to improve the internal electric fields distribution. As a result, the optimum mass resolution of the ion with m/z 1892 Th could reach 8387 when rx/ry = 5.75/5 and scan rate was 1500 Th s−1. Meanwhile, the resolution of the mass spectrum was in excess of 23000 when the scan rate was decreased to about 300 Th s−1.