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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/amt-2019-163
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2019-163
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 03 Jun 2019

Submitted as: research article | 03 Jun 2019

Review status
This discussion paper is a preprint. A revision of the manuscript is under review for the journal Atmospheric Measurement Techniques (AMT).

Increase of the particle hit rate in laser single particle mass spectrometer by pulse delayed extraction technology

Ying Chen1,2, Viacheslav Kozlovskiy3,5, Xubing Du1,2, Jinnuo Lv6, Sergei Nikiforov4, Jiajun Yu1,2, Alexander Kolosov3, Wei Gao1,2, Zhen Zhou1,2, Zhengxu Huang1,2, and Lei Li1,2 Ying Chen et al.
  • 1Institute of Mass Spectrometer and Atmospheric Environment, Jinan University, Guangzhou, 510632, China
  • 2Guangdong Provincial Engineering Research Center for on-line source apportionment system of air pollution, Guangzhou, 510632, China
  • 3Talrose Institute for Energy Problems of Chemical Physics, Russian Academy of Science, Chernogolovka, 142432, Russia
  • 4Prokhorov General Physics Institute, Russian Academy of Science, Moscow 119991, Russia
  • 5Institute of Physiologically Active Compounds Russian Academy of Science, Chernogolovka, Moscow region, 142432, Russia
  • 6Guangzhou Hexin Analytical Instrument Limited Company, Guangzhou, 510530, China

Abstract. Single particle mass spectrometer is the instrument providing a plenty of valuable information on chemical and physical parameters of individual particles in real time. One of the main performance criteria of the instrument is the efficiency of particles detection (hit rate). Most of SPMS instruments use DC extraction, when the stationary high voltage is applied to the extraction electrodes. As the aerosol particles initially carry a certain charge, they can be deflected by this electric field thus decreasing the hit rate. It was realized in this work, that the delay extraction technique can eliminate the stochastic dispersion of the particles beam caused by their deflection in the stationary electric field. As the result, the hit rate of the instrument can be significantly improved. Also, as the effect of deflection in the electric field is mass dependent, it can cause the distortion of the measured size distribution of the particles. Hence, the delay extraction can bring the measured distribution closer to the real one. Thus, the delay extraction technique provides not only mass resolution improvement, but also increases the hit rate. The gain in the hit rate depends on the type of the particles. It can be two orders of magnitude for model particles, and up to 2–4 times for real particles. In the present work we report experiments and results showing the effect of the delay extraction on the particles beam divergence caused by particles charge, the hit rate improvement and the effect of the delay extraction on the measured particles size distribution.

Ying Chen et al.
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Ying Chen et al.
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Short summary
Ion delayed extraction technique in single particle mass spectrometry has been found to improve the mass resolution of instruments. Through further research, it was found that it can improve the aerosol particle detection efficiency, because it can eliminate the influence of electric field on the charged aerosol trajectory, so that more effective data can be obtained in a short time in laboratory or atmospheric aerosol research, especially in low concentration aerosol sample analysis.
Ion delayed extraction technique in single particle mass spectrometry has been found to improve...
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