Laser Ionization Mass Spectroscopy of Single Aerosol Particles
Open Access
- 1 January 1995
- journal article
- research article
- Published by Taylor & Francis in Aerosol Science and Technology
- Vol. 22 (3) , 237-249
- https://doi.org/10.1080/02786829408959743
Abstract
We describe an instrument that measures the chemical composition of single aerosol particles. To facilitate detection of volatile species, particles are analyzed less than 0.5 ms after leaving ambient conditions and without touching any surfaces. Particles are introduced into a vacuum through a differentially pumped nozzle, then cross a He-Ne laser beam. The scattered light provides both size information and the trigger for an excimer laser that desorbs and ionizes molecules from the particle. Mass spectra with excellent signal to noise have been obtained from laboratory and ambient particles 0.3 to 16 μm diameter.Keywords
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