Resonant multiphoton ionization promises to be a sensitive technique for the measurement of trace concentrations of gases in atmospheric or other complex gas mixtures. Compared with laser-induced fluorescence, photoionization has the advantages of high collection efficiency and fewer problems with quenching phenomena. By employing low-order processes (one or two photons) for each resonant transition it is possible to achieve efficient ionization with relatively modest light intensities.

© 1982 Optical Society of America

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