Citation: XU Fu-Xing, JIN Liu-Yu, QIAN Bing-Jun, WANG Wei-Min, DING Chuan-Fan. Effect of Dodecapole Electric Field on Performance of Linear Ion Trap Mass Analyzer[J]. Chinese Journal of Analytical Chemistry, ;2021, 49(8): 1282-1288. doi: 10.19756/j.issn.0253-3820.201580 shu

Effect of Dodecapole Electric Field on Performance of Linear Ion Trap Mass Analyzer

Key Laboratory of Advanced Mass Spectrometry and Molecular Analysis of Zhejiang Province, Institute of Mass Spectrometry, School of Material Science and Chemical Engineering, Ningbo University, Ningbo 315211, China

Corresponding author: XU Fu-Xing, DING Chuan-Fan,
Received Date: 29 September 2020
Revised Date: 1 April 2021

Fund Project: Supported by the National Natural Science Foundation of China (Nos.21803013, 21773035).

For the simplified linear ion traps (LITs), the use of non-hyperbolic electrodes might produce even greater proportions of higher-order field components. Different higher-order fields will have different effects on the ion trap performance. In this work, the performances of semi-circular rod electrode LITs with different dodecapole electric field components were investigated by theoretical simulations and experiments. Different amplitude dodecapole field (A6) components were added to the quadrupole field (A2) by changing the ratio between the circular electrode radii and the electric field radii. In theoretical simulation calculations and experimental research, the mass resolution gradually improved to a maximum of 1250 (full-width at half-maximum=0.14) at m/z 175 Da when A6/A2 decreased from 1.91% to 0.03%, but when A6/A2 was negative, the mass resolution was seriously degraded. The experimental results coincided with those of the theoretical calculation. The collision-induced dissociation (CID) efficiency was also affected by the amount of higher-order field A6, and as a result, when A6/A2=0.03%, the highest CID efficiency was obtained.
- Linear ion trap,
- Dodecapole electric field,
- Mass resolution,
- Collision induced dissociation,
- Higher-order field
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