NONDESTRUCTIVE DETECTION OF IONS IN A QUADRUPOLE ION-TRAP USING A DC PULSE TO FORCE COHERENT ION MOTION - A SIMULATION STUDY
NONDESTRUCTIVE DETECTION OF IONS IN A QUADRUPOLE ION-TRAP USING A DC PULSE TO FORCE COHERENT ION MOTION - A SIMULATION STUDY
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DOI：
10.1016/0168-1176(95)04209-4
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发表时间：
1995-08-31
期刊：
影响因子：
--
通讯作者：
JULIAN, RK
中科院分区：
文献类型：
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作者：
COOKS, RG;CLEVEN, CD;JULIAN, RK
对离子集合运动的模拟和实验表明，在轴向施加脉冲激励，迫使离子以特征的长期频率进行相干运动。离子陷阱模拟程序ITSIM考虑了离子/分子碰撞的影响，结果表明，即使在有浴气存在的情况下，这种运动也是非常稳定的。与离子运动的实验数据，特别是与使用直流泵浦/激光探测方法获得的离子运动的数据，以及空间和时间分辨激光层析实验的结果进行了比较。这些观测结果构成了一种建议的离子质量选择和无损探测模式的基础，在这种模式下，使用直流脉冲激发。脉冲之后是图像电流的检测。通过对模拟数据的傅里叶变换和对所产生的图像电流的模拟来检验该方案。与早期用交流实现轴向激励的实验结果进行了比较。菲尔德。
Simulations and experiments on the motion of collections of ions show that impulsive excitation, applied in the axial direction, forces ions into coherent motion with characteristic secular frequencies. A version of the ion trap simulation program, ITSIM, which accounts for the effects of ion/molecule collisions, is applied to show that this motion is remarkably stable even in the presence of bath gas. Comparisons are made with experimental data on ion motion, specifically with data obtained on ion motion using the d.c.-pump/laser-probe method, and with results of spatially- and temporally-resolved laser tomography experiments. These observations form the basis for a suggested mode of mass-selective and non-destructive detection of ions in which impulsive excitation, using a d.c. pulse, is followed by detection of the image current. This proposal is tested by Fourier transformation of the simulated data and by simulation of the resulting image currents. Comparisons are made with the results of earlier experiments in which axial excitation is achieved using an a.c. field.