The need for a continuous monitor for environmentally important pollutants at realistic [parts-per-trillion (parts in 10<sup>12</sup>)] concentrations measured in real time (minutes) is widely recognized. We developed an instrument that is based on supersonic-jet expansion and cooling, followed by resonantly enhanced multiphoton ionization (REMPI) into a mass spectrometer. This approach furnishes the dual selectivity of narrow-band tuned laser absorption and mass analysis. We initiated a spectroscopic characterization of the jet’s collisional cooling behavior to optimize the instrument’s sensitivity and selectivity, made measurements of several aromatic compounds (including polychlorinated dioxins) by use of a one-color REMPI scheme, and demonstrated a two-color excitation scheme.
© 2001 Optical Society of America
Harald Oser, Michael J. Coggiola, Gregory W. Faris, Steve E. Young, Bengt Volquardsen, and David R. Crosley, "Development of a Jet-REMPI (Resonantly Enhanced Multiphoton Ionization) Continuous Monitor for Environmental Applications," Appl. Opt. 40, 859-865 (2001)