基于双环形光捕获的气溶胶单颗粒LIBS分析方法

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中图分类号：0433.1 DOI：10.16152/j. cnki. xdxbzr. 2025-06-009

Single-particle LIBS analysis method for aerosol based on dual-annular beam trapping

CHENG Xuemei¹， ZHANG Ying²，LI Jiayan （1.Institute of Photonics & Photon-Technology，Northwest University，Xi'an 71O069，China; 2.Foundation Department，Engineering University of PAP，Xi'an 71OO86，China）

AbstractAerosols have significant impacts on human health，ecological environments，and climate change. In situ monitoring of the physical and chemical composition of individual atmospheric aerosol particles is crucial for studying the formation and evolution mechanismsof polltants，playing avital role in traceability and precise prevention and control of polution.Optical trapping technology combined with laser-induced breakdown spectroscopy（LIBS） has emerged in recent years as an effective single-particle analysis method. However，limited byoptical trapping efficiency and stability，current approaches still suffer from low analytical efficiency，particularly in analyzing transparent particles.To address this，this study proposes a single-particle analysis method based on " dual-ring optical trapping + LIBS technology". Using a trapping scheme with two counter-propagating horizontal ring-shaped beams，it effectively overcomes the isses of low trapping fficiency and poor stability caused by excessive optical scatering forces in gaseous environments.This setup enables stable trapping of both transparent and light-absorbing particles within the same device，thereby improving the effciencyand universality of single-particle analysis.This method can be widely applied for in situ analysis of single particles in gaseous environments，contributing to research on the formation mechanisms of atmospheric particulate pollutants and pollution traceability.

Keywordsaerosol; cross phase modulation; dual-annular beam trapping; laser induced breakdown spectros copy

气溶胶是指悬浮在气体介质中的固态或液态颗粒物（粒径在 1nm 到 100μm ）。（剩余17530字）