Novel radio-frequency quadrupole ion trap with spherical geometry

作者：Noshad Houshyar^*; Honari Latifpour Mostafa

来源：International Journal of Mass Spectrometry, 2014, 374: 49-54.

DOI：10.1016/j.ijms.2014.10.011

• Novel spherical ion trap
• Nonlinearity
• Elimination of electric octupole component
• Optimization
• Stability regions
• Fourth- and fifth-order Runge-Kutta methods

Confinement of single ions in a novel radio-frequency (RF) quadrupole ion trap with spherical shape is investigated. An optimization of this spherical ion trap (SIT) is carried out in order to suppress its nonlinearity substantially by eliminating the electric octupole moment. Hence, a trapping potential and consequently an electric field very similar to the ideal quadrupole ion trap (QIT) are obtained. Afterwards, three stability regions for the optimized SIT are numerically computed. The regions coincide well with those reported in the literature for the ideal OIT. The reason is attributed to the zero electric octupole moment of our proposed trap. The simple geometry of our optimized SIT and relative ease of fabrication along with its increased trapping volume in comparison with the conventional hyperbolic quadrupole ion trap, make it an appropriate choice for miniaturization.

• 出版日期2014-12-1