Gaseous phase ion detection method based on laser-induced fluorescence for ion mobility spectrometer

Kaitai Guo; Kai Ni; Guangli Ou; Xiaoguo Zhang; Quan Yu; Xiang Qian; Xiaohao Wang

doi:10.1117/12.2193340

5 August 2015 Gaseous phase ion detection method based on laser-induced fluorescence for ion mobility spectrometer

Kaitai Guo, Kai Ni, Guangli Ou, Xiaoguo Zhang, Quan Yu, Xiang Qian, Xiaohao Wang

Proceedings Volume 9621, 2015 International Conference on Optical Instruments and Technology: Advanced Lasers and Applications; 96210W (2015) https://doi.org/10.1117/12.2193340
Event: International Conference on Optical Instruments and Technology 2015, 2015, Beijing, China

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.

Citation Download Citation

Kaitai Guo, Kai Ni, Guangli Ou, Xiaoguo Zhang, Quan Yu, Xiang Qian, and Xiaohao Wang "Gaseous phase ion detection method based on laser-induced fluorescence for ion mobility spectrometer", Proc. SPIE 9621, 2015 International Conference on Optical Instruments and Technology: Advanced Lasers and Applications, 96210W (5 August 2015); https://doi.org/10.1117/12.2193340

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