Abstract

Laser Multiphoton Ionization was applied for direct environmental analysis, under ambient conditions. In most applications, the fast-conductance detection system was used, where the laser induced photocharges are registered as a function of time. The studied environmental applications include contaminated soils, airborne contaminants and polycyclic aromatic hydrocarbons (PAH) in liquids. A modification of this technique, involving monitoring of the ion-induces mirror-charges, was applied of sensitive air analysis. The MPI techniques were successfully introduced for routine environmental analysis of organic contaminants such as PAHs.

© 2000 Optical Society of America