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Citation: YUAN Guang-Zhou, ZHANG Zai-Yue, QIAN Jie, ZHANG Shu-Guang, YAO Ru-Jiao, HE Yang, LI Xiao-Xu. A Theoretical Study for Performance Optimization of Half Round Rod Electrode Linear Ion Trap[J]. Chinese Journal of Analytical Chemistry, ;2016, 44(11): 1780-1785. doi: 10.11895/j.issn.0253-3820.160455 shu

A Theoretical Study for Performance Optimization of Half Round Rod Electrode Linear Ion Trap

School of Mechanical and Electrical Engineering, Soochow University, Suzhou 215021, China

Received Date: 13 June 2016
Revised Date: 23 August 2016

Half round rod electrode linear ion trap (HreLIT) has many advantages such as simple structure, ease of manufacture and high assembly accuracy. A novel HreLIT with slot on each electrode was proposed to improve the performance of HreLIT. The ratio of field radius and electrode radius (r/r₀) and "stretch" distance were optimized to improve the performance of HreLIT. In this study, mass spectrum was achieved by ion trajectory simulation in HreLITs with different geometry and dimension, and mass resolution and ion abundance were used to evaluate the performance of HreLIT. The results showed that the performance of HreLIT with r/r₀=5:5 was significantly improved when "stretch" distance ranged from 0.8 to 1.2 mm. And the best mass resolution was achieved when the "stretch" distance was 0.9 mm. When the scan rate was about 409 Da/s, a mass resolution up to 6264 (M/ΔM, FWHM) was achieved for ions with m/z=609 Da. For comparison, linear ion trap with hyperbolic electrodes was also simulated and optimized, and it was shown that the performance of optimized HreLIT was equal to that of linear ion trap with hyperbolic electrodes.
- Half round rod electrode linear ion trap,
- Simulation,
- Mass resolution,
- "Stretch" distance
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