Excitation frequencies of ions confined in a quadrupole field with quadrupole excitation
Excitation frequencies of ions confined in a quadrupole field with quadrupole excitation
复制标题
四极激发限制在四极场中的离子的激发频率
DOI：
10.1016/s1044-0305(99)00111-7
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发表时间：
2000
影响因子：
3.2
通讯作者：
T. Glebova
中科院分区：
文献类型：
--
作者：
M. Sudakov;N. Konenkov;D. J. Douglas;T. Glebova
从理论上研究了角频率为Ω的激励信号对角频率为Ω的射频四极场中离子的共振四极激励。结果表明，激励频率谱具有相当大的结构，对应于不同阶次的激励。一般情况下K= 1,2,3，…阶的谐振条件为ω (K) n=（Ω/K）| n+ β|,−∞< n<∞，其中K为谐振阶数，β和n确定无扰动振荡频率。通过对运动方程的直接数值解，构造了不同稳定性参数β= 0.1、0.5和0.9时离子振荡的共振曲线。研究了离子在不同阶共振激励下的运动轨迹。当K阶为2或更高时，离子运动呈现出振幅随时间整体增加的节拍特征。建立了四极激励下离子在质量过滤器中运动的稳定性图。
Resonant quadrupole excitation of ions confined in a radio frequency quadrupole field with angular frequency Ω by an excitation signal with angular frequency ω has been investigated theoretically. It is shown that the spectrum of excitation frequencies has considerable structure which corresponds to different orders of excitation. The resonance condition for orders K= 1, 2, 3,… in the general case has been obtained as ω (K) n=(Ω/K)| n+ β|,−∞< n<∞, where K is the order of the resonance and β and n determine the unperturbed oscillation frequencies. Resonance curves for ion oscillations with different stability parameters β= 0.1, 0.5, and 0.9 have been constructed by means of direct numerical solution of the equations of motion. The trajectories of ion motion under resonant excitation of different orders have been investigated. For orders K of two and higher, the ion motion shows a beat character with an overall increase of amplitude with time. The stability diagram for ion motion in a mass filter in the presence of quadrupole excitation has been constructed.