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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 46, Iss. 19 — Jul. 1, 2007
  • pp: 4008–4014

Detection of mercuric chloride by photofragment emission using a frequency-converted fiber amplifier

Alexandra A. Hoops, Thomas A. Reichardt, Dahv. A. V. Kliner, Jeffrey P. Koplow, and Sean W. Moore  »View Author Affiliations

Applied Optics, Vol. 46, Issue 19, pp. 4008-4014 (2007)

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A real-time, noninvasive approach for detecting trace amounts of vapor-phase mercuric chloride ( HgCl 2 ) in combustion flue gas is demonstrated using a near-infrared pulsed fiber amplifier that is frequency converted to the ultraviolet. Excitation of the HgCl 2 ( 1 1 u 1 1 g + ) transition at 213   nm generates 253 .7   nm emission from the Hg   ( 6 P 3 1 ) photoproduct that is proportional to the concentration of HgCl 2 . A measured quadratic dependence of the HgCl 2 photofragment emission (PFE) signal on the laser irradiance indicates that the photodissociation process involves two-photon excitation. Additionally, low concentrations of HgCl 2 are detected with the PFE approach in an environment characteristic of coal-fired power-plant flue gas using this compact solid-state laser source. A detection limit of 0.7 ppb is extrapolated from these results.

© 2007 Optical Society of America

OCIS Codes
(120.0280) Instrumentation, measurement, and metrology : Remote sensing and sensors
(280.1120) Remote sensing and sensors : Air pollution monitoring
(300.2530) Spectroscopy : Fluorescence, laser-induced

ToC Category:
Laser-Induced Breakdown Spectroscopy, Plasmas, and Emission

Original Manuscript: September 29, 2006
Manuscript Accepted: December 13, 2006
Published: June 12, 2007

Alexandra A. Hoops, Thomas A. Reichardt, Dahv. A. V. Kliner, Jeffrey P. Koplow, and Sean W. Moore, "Detection of mercuric chloride by photofragment emission using a frequency-converted fiber amplifier," Appl. Opt. 46, 4008-4014 (2007)

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