Noshad Houshyar, Amouhashemi Majid
1 Department of Energy Engineering and Physics, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran.
2 Institute for Studies in Theoretical Physics and Mathematics (IPM), Tehran, Iran.
Eur J Mass Spectrom (Chichester). 2017 Oct;23(5):272-279. doi: 10.1177/1469066717712440. Epub 2017 Jun 15.
The cylindrical ion trap is analyzed so that the octupole component of the electric field inside the trap is set to zero. As a consequence, the diameter to height ratio is computed to be 1.20 for which the quadrupole component of the cylindrical ion trap is dominant. Afterwards, it is concluded that the electric potential inside the trap as well as the corresponding stability regions are very similar to those obtained for an ideal Paul trap with pure quadrupole electric field. Furthermore, we drew a conclusion that the stability diagrams of the cylindrical ion trap without octupole term and the stability diagrams of the Paul trap have 5.6%, 3.7%, and 2.9% discrepancy for the first, second, and third stability diagrams, respectively. It should be noted that, expansion of the electric potential inside the cylindrical ion trap in terms of the multipole electric field components and making the advantages of the octupole term elimination has not been reported in the literature previously.
对圆柱形离子阱进行了分析，以使阱内电场的八极分量设置为零。结果，计算出直径与高度之比为1.20，对于该比值，圆柱形离子阱的四极分量占主导。之后，得出结论，阱内的电势以及相应的稳定区域与具有纯四极电场的理想保罗阱所获得的非常相似。此外，我们得出结论，对于第一、第二和第三稳定图，没有八极项的圆柱形离子阱的稳定图与保罗阱的稳定图分别有5.6%、3.7%和2.9%的差异。应当指出，以前文献中尚未报道过根据多极电场分量对圆柱形离子阱内的电势进行展开以及消除八极项的优点。
