Abstract
The need for a continuous monitor for environmentally important pollutants at realistic [parts-per-trillion (parts in 1012)] 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
Full Article | PDF ArticleMore Like This
Jack A. Syage, James E. Pollard, and Ronald B. Cohen
Appl. Opt. 26(17) 3516-3520 (1987)
Kui Chen, Jack E. Pender, John L. Ferry, and S. Michael Angel
Appl. Opt. 43(33) 6207-6212 (2004)
Jeffrey M. Headrick, Thomas A. Reichardt, Thomas B. Settersten, Ray P. Bambha, and Dahv A. V. Kliner
Appl. Opt. 49(11) 2204-2214 (2010)