Laser-induced volatilization and ionization of aerosol particles for their mass spectral analysis in real time

Mahadeva P. Sinha

doi:10.1117/12.45140

1 April 1991 Laser-induced volatilization and ionization of aerosol particles for their mass spectral analysis in real time

Mahadeva P. Sinha

Author Affiliations +

Proceedings Volume 1437, Applied Spectroscopy in Material Science; (1991) https://doi.org/10.1117/12.45140
Event: Optics, Electro-Optics, and Laser Applications in Science and Engineering, 1991, Los Angeles, CA, United States

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.

Citation Download Citation

Mahadeva P. Sinha "Laser-induced volatilization and ionization of aerosol particles for their mass spectral analysis in real time", Proc. SPIE 1437, Applied Spectroscopy in Material Science, (1 April 1991); https://doi.org/10.1117/12.45140

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