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Proceedings Paper

Laser-induced volatilization and ionization of aerosol particles for their mass spectral analysis in real time
Author(s): Mahadeva P. Sinha
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Paper Abstract

A method for the chemical analysis of individual aerosol particles on a real-time basis has been developed. This is accomplished by measuring their mass spectra. In this method, particles are directly introduced in the ion source of the mass spectrograph in the form of a beam. Volatilization and ionization of a particle in an ion source of the mass spectrograph is performed by using a pulsed high-energy Nd-YAG laser. Each particle, when hit by the laser pulse, produces a burst of ions of different masses. These ions are spatially separated according to their masses along the focal plane of a mass spectrograph and their intensities are measured simultaneously by an array detector. Some of the preliminary results on the mass spectral measurement of potassium biphthalate particles are presented. Volatilization and ionization of particles eliminate any possible substrate sample matrix interferences in the analysis. In order to preserve the real-time feature of the method for the analysis of particles present in low concentrations, the aerosol sample is concentrated by using a two-stage virtual impactor.

Paper Details

Date Published: 1 April 1991
PDF: 7 pages
Proc. SPIE 1437, Applied Spectroscopy in Material Science, (1 April 1991); doi: 10.1117/12.45140
Show Author Affiliations
Mahadeva P. Sinha, Jet Propulsion Lab. (United States)

Published in SPIE Proceedings Vol. 1437:
Applied Spectroscopy in Material Science
David D. Saperstein, Editor(s)

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