Single-particle Raman spectroscopy for studying physical and chemical processes of atmospheric particles

Zhancong Liang, Yangxi Chu, Masao Gen, Chak K. Chan

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

Atmospheric particles experience various physical and chemical processes and change their properties during their lifetime. Most studies on atmospheric particles, both in laboratory and field measurements, rely on analyzing an ensemble of particles. Because of different mixing states of individual particles, only average properties can be obtained from studies using ensembles of particles. To better understand the fate and environmental impacts of atmospheric particles, investigations on their properties and processes at a single-particle level are valuable. Among a wealth of analytic techniques, single-particle Raman spectroscopy provides an unambiguous characterization of individual particles under atmospheric pressure in a non-destructive and in situ manner. This paper comprehensively reviews the application of such a technique in the studies of atmospheric particles, including particle hygroscopicity, phase transition and separation, and solute-water interactions, particle pH, and multiphase reactions. Investigations on enhanced Raman spectroscopy and bioaerosols on a single-particle basis are also reviewed. For each application, we describe the principle and representative examples of studies. Finally, we present our views on future directions on both technique development and further applications of single-particle Raman spectroscopy in studying atmospheric particles.
Original languageEnglish (US)
Pages (from-to)3017-3044
Number of pages28
JournalAtmospheric Chemistry and Physics
Volume22
Issue number5
DOIs
StatePublished - Mar 7 2022
Externally publishedYes

ASJC Scopus subject areas

  • Atmospheric Science

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