Supramicrometer particle shadowgraph imaging in the ionization region of a single particle aerosol mass spectrometer

George R. Farquar, Paul T. Steele, Erica L. McJimpsey, Carlito B Lebrilla, Herbert J. Tobias, Eric E. Gard, Matthias Frank, Keith Coffee, Vincent Riot, David P. Fergenson

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

An in situ method to image individual aerosol particles upon desorption/ionization in a single particle aerosol mass spectrometer using shadowgraph imaging is presented and applied directly to determine a 2D spatial distribution of 5.0 μ m particles. This new technique is complementary to previously reported methods for the determination of focused particle beam profiles and has several advantages, including a very low particle concentration requirement and the ability to collect the image of an individual particle with a correlated mass spectrum. Images are presented for 1.3, 2.1, 3.0, and 5.0 μ m polystyrene latex spheres. Particle beam profiles are presented in the directions perpendicular and parallel to the particle beam axis. These results are qualitatively compared to those of a complementary particle collection method (dusting) used at Lawrence Livermore National Laboratory to characterize aerosol beam focusing.

Original languageEnglish (US)
Pages (from-to)10-18
Number of pages9
JournalJournal of Aerosol Science
Volume39
Issue number1
DOIs
StatePublished - Jan 2008

Keywords

  • Aerosol
  • Mass spectrometry
  • Shadowgraph
  • Single particle imaging

ASJC Scopus subject areas

  • Atmospheric Science
  • Environmental Science(all)

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    Farquar, G. R., Steele, P. T., McJimpsey, E. L., Lebrilla, C. B., Tobias, H. J., Gard, E. E., Frank, M., Coffee, K., Riot, V., & Fergenson, D. P. (2008). Supramicrometer particle shadowgraph imaging in the ionization region of a single particle aerosol mass spectrometer. Journal of Aerosol Science, 39(1), 10-18. https://doi.org/10.1016/j.jaerosci.2007.09.010