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Vitcher S, Charvy C, Dudragne L, Tabet JC. Characterization of an electron ionization source trap operating in the presence of a magnetic field through computer simulation. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2013; 24:1130-1136. [PMID: 23715869 DOI: 10.1007/s13361-013-0641-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2013] [Revised: 04/08/2013] [Accepted: 04/10/2013] [Indexed: 06/02/2023]
Abstract
We explore the feasibility of conducting electron ionization (EI) in a radio-frequency (rf) ion source trap for mass spectrometry applications. Electrons are radially injected into a compact linear ion trap in the presence of a magnetic field used essentially to lengthen the path of the electrons in the trap. The device can either be used as a stand-alone mass spectrometer or can be coupled to a mass analyzer. The applied parallel magnetic field and the oscillating rf electric field produced by the trap give rise to a set of coupled Mathieu equations of motion. Via numerical simulations, electron trajectories are studied under varying intensities of the magnetic field in order to determine the conditions that enhance ion production. Likewise, the dynamic behavior of the ions are investigated in the proposed EI source trap and the fast Fourier transform FFT formalism is used to obtain the frequency spectrum from the numerical simulations to study the motional frequencies of the ions which include combinations of the low-frequency secular and the high-frequency micromotion with magnetron and cyclotron frequencies. The dependence of these motional frequencies on the trapping conditions is examined and particularly, the limits of applying a radial magnetic field to the EI ion trap are characterized.
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Affiliation(s)
- Sarah Vitcher
- Thales Communications and Security, Vélizy-Villacoublay, France.
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Wu Q, Hua L, Hou K, Cui H, Chen W, Chen P, Wang W, Li J, Li H. Vacuum Ultraviolet Lamp Based Magnetic Field Enhanced Photoelectron Ionization and Single Photon Ionization Source for Online Time-of-Flight Mass Spectrometry. Anal Chem 2011; 83:8992-8. [DOI: 10.1021/ac201791n] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Qinghao Wu
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, People’s Republic of China
- Graduate School of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
| | - Lei Hua
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, People’s Republic of China
- Graduate School of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
| | - Keyong Hou
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, People’s Republic of China
| | - Huapeng Cui
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, People’s Republic of China
- Graduate School of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
| | - Wendong Chen
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, People’s Republic of China
- Graduate School of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
| | - Ping Chen
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, People’s Republic of China
- Graduate School of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
| | - Weiguo Wang
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, People’s Republic of China
| | - Jinghua Li
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, People’s Republic of China
| | - Haiyang Li
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, People’s Republic of China
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Alderwick AR, Jardine AP, Hedgeland H, MacLaren DA, Allison W, Ellis J. Simulation and analysis of solenoidal ion sources. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2008; 79:123301. [PMID: 19123556 DOI: 10.1063/1.3030858] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We present a detailed analysis and simulation of solenoidal, magnetically confined electron bombardment ion sources, aimed at molecular beam detection. The aim is to achieve high efficiency for singly ionized species while minimizing multiple ionization. Electron space charge plays a major role and we apply combined ray tracing and finite element simulations to determine the properties of a realistic geometry. The factors controlling electron injection and ion extraction are discussed. The results from simulations are benchmarked against experimental measurements on a prototype source.
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Affiliation(s)
- A R Alderwick
- Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, United Kingdom
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Current literature in mass spectrometry. JOURNAL OF MASS SPECTROMETRY : JMS 2006; 41:128-39. [PMID: 16402416 DOI: 10.1002/jms.948] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
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