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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 45, Iss. 24 — Aug. 20, 2006
  • pp: 6180–6186

Pulsed laser photofragment emission for detection of mercuric chloride

Alexandra A. Hoops and Thomas A. Reichardt  »View Author Affiliations


Applied Optics, Vol. 45, Issue 24, pp. 6180-6186 (2006)
http://dx.doi.org/10.1364/AO.45.006180


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Abstract

The viability of pulsed laser photofragment emission (PFE) is evaluated for the in situ measurement of vapor-phase mercuric chloride ( HgCl 2 ) concentration in combustion flue gas. Dispersed emissions from both the Hg ( 6 P 1 3 ) and HgCl ( B Σ + 2 ) photoproducts are presented, and the dependence of the HgCl 2 PFE signal originating from Hg ( 6 P 1 3 ) on the collisional environment is examined for buffer-gas mixtures of N 2 , O 2 , and CO 2 . Integrated PFE intensity measurements as a function of buffer gas pressure support the assumption that the primary effect of the relevant flue gas constituents is to quench emission from Hg ( 6 P 1 3 ) . The quenching rate constants for PFE from HgCl 2 were measured to be 1.37 ( ± 0.16 ) × 10 5 Torr 1 s 1 for N 2 , 9.35 ( ± 0.25 ) × 10 6 Torr 1 s 1 for O 2 , and 1.49 ( ± 0.29 ) × 10 6 Torr 1 s 1 for CO 2 . These values are in good accord with literature values for the quenching of Hg ( 6 P 1 3 ) . The emission cross section for Hg ( 6 P 1 3 ) generated by photodissociation of HgCl 2 in 760   Torr   N 2 is found to be 1.0 ( ± 0.2 ) × 10 25 m 2 by comparing the PFE signal to N 2 Raman scattering.

© 2006 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

History
Original Manuscript: September 30, 2005
Revised Manuscript: February 24, 2006
Manuscript Accepted: February 27, 2006

Citation
Alexandra A. Hoops and Thomas A. Reichardt, "Pulsed laser photofragment emission for detection of mercuric chloride," Appl. Opt. 45, 6180-6186 (2006)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-45-24-6180


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