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Proceedings Paper

Gaseous phase ion detection method based on laser-induced fluorescence for ion mobility spectrometer
Author(s): Kaitai Guo; Kai Ni; Guangli Ou; Xiaoguo Zhang; Quan Yu; Xiang Qian; Xiaohao Wang
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Paper Abstract

Ion mobility spectrometry (IMS) is widely used in the field of chemical composition analysis. Faraday cup is the most classical method to detect ions for IMS in the atmospheric pressure. However, the performance of Faraday plate was limited by many kinds of factors, including interfering electromagnetic waves, thermal(Johnson) noise, induced current , gain bandwidth product, etc. There is a theoretical limit in detection of ions at ambient condition which is approximately 106 ions per second. In this paper, we introduced a novel way using laser-induced fluorescence (LIF) to bypass the limitation of Faraday plate. Fluorescent ions which were selected by IMS get excited when they fly through the laser excitation area. The fluorescence emitted by the excited ions was captured exponentially and amplified through proper optoelectronic system. Rhodamine 6G (R6G) was selected as the fluorochrome for the reason that excitation wavelength, emission wavelength, and fluorescence quantum yield were more appropriate than others. An orthometric light path is designed to eliminate the adverse impact which was caused by induced laser. The experiment result shows that a fluorescence signal from the sample ions of the IMS could be observed. Compared with Faraday plate, the LIF-IMS may find a potential application in more system at the atmosphere condition.

Paper Details

Date Published: 5 August 2015
PDF: 8 pages
Proc. SPIE 9621, 2015 International Conference on Optical Instruments and Technology: Advanced Lasers and Applications, 96210W (5 August 2015); doi: 10.1117/12.2193340
Show Author Affiliations
Kaitai Guo, Tsinghua Univ. (China)
Kai Ni, Tsinghua Univ. (China)
Guangli Ou, Tsinghua Univ. (China)
Xiaoguo Zhang, Tsinghua Univ. (China)
Quan Yu, Tsinghua Univ. (China)
Xiang Qian, Tsinghua Univ. (China)
Xiaohao Wang, Tsinghua Univ. (China)

Published in SPIE Proceedings Vol. 9621:
2015 International Conference on Optical Instruments and Technology: Advanced Lasers and Applications
Jianqiang Zhu; Chunqing Gao, Editor(s)

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