Method for improving CID efficiency of linear ion trap

The invention provides a method for improving the CID efficiency of a linear ion trap, and the method comprises the steps: exerting a DC voltage on end cover electrodes at an ion inlet end and an ion outlet end of the linear ion trap, and enabling the amplitude of the DC voltage to be larger than the amplitude of the DC voltage on a cylindrical electrode of the ion trap; the voltage amplitude on one or two end cover electrodes is switched, so that the relative potential between the two end cover electrodes is switched from a positive value to a negative value; and ions in the linear ion trap move back and forth between the two end cover electrodes along the axial direction of the ion trap, so that the CID efficiency is improved. The method has the advantages of high CID efficiency and the like. 本发明提供了提高线性离子阱CID效率的方法，所述提高线性离子阱CID效率的方法为：在所述线性离子阱的离子入口端和出口端的端盖电极上施加直流电压，直流电压幅值大于所述离子阱的柱状电极上的直流电压幅值；切换一个或二个端盖电极上的电压幅值，使得二个端盖电极间相对电位从正值切换为负值；线性离子阱内的离子在二个端盖电极之间沿着离子阱的轴向来回移动，提高了CID效率。本发明具有CID效率高等优点。