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四极杆质量分析器(即四极质谱仪)因其结构简单、价格较低,被广泛应用于各分析测量领域。围绕着四极杆质量分析器的使用要求,基于四极场离子运动理论基础,结合粒子碰撞理论,利用有限元分析软件COMSOL对四极场电压进行了仿真模拟。结合电场仿真的结果,对四极场中离子轨迹进行了仿真研究。仿真分析了压强大小以及a、q值对离子轨迹和通过率的影响。结果表明四极杆质量分析器应在低于10-2Pa压强下运行。在q值不变情况下,a值的增大会导致通过率降低,另外,q值大小对离子通过率也有较大影响。仿真结果为探索四极杆质量分析器的研制可提供理论和技术上的支持。
Quadrupole mass analyzer (quadrupole mass spectrometer) is widely used in various fields of analysis and measurement due to its simple structure and low price. Based on the application of quadrupole mass analyzer, based on the theory of quadrupole field ion motion and particle collision theory, the quadrupole field voltage was simulated by finite element analysis software COMSOL. Combined with the result of electric field simulation, the ion trajectory in quadrupole field is simulated. The effects of pressure magnitude and a, q values on ion trajectory and passage rate were analyzed. The results show that the quadrupole mass analyzer should operate at pressures below 10-2Pa. In the case of constant q value, the increase of a value will lead to the decrease of passing rate. In addition, the value of q value also has a great influence on the ion passage rate. The simulation results provide theoretical and technical support for the exploration of the quadrupole mass analyzer.