Abstract

The viability of pulsed laser photofragment emission (PFE) is evaluated for the in situ measurement of vapor-phase mercuric chloride (HgCl2) concentration in combustion flue gas. Dispersed emissions from both the Hg(6P13) and HgCl(BΣ+2) photoproducts are presented, and the dependence of the HgCl2 PFE signal originating from Hg(6P13) on the collisional environment is examined for buffer-gas mixtures of N 2, O 2, and CO2. 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(6P13). The quenching rate constants for PFE from HgCl2 were measured to be 1.37(±0.16)×105Torr1s1 for N 2, 9.35(±0.25)×106Torr1s1 for O 2, and 1.49(±0.29)×106Torr1s1 for CO2. These values are in good accord with literature values for the quenching of Hg(6P13). The emission cross section for Hg(6P13) generated by photodissociation of HgCl2 in 760  Torr  N 2 is found to be 1.0(±0.2)×1025m 2 by comparing the PFE signal to N 2 Raman scattering.

© 2006 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
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
Appl. Opt. 46(19) 4008-4014 (2007)

Impact of collisional quenching on the detection of HgCl2 via photofragment emission

Alexandra A. Hoops and Thomas A. Reichardt
Appl. Opt. 48(4) B32-B42 (2009)

Carbon dioxide laser monitor for NH3 in flue gas

Alexander Stein, T. R. Todd, and B. N. Perry
Appl. Opt. 22(21) 3378-3381 (1983)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (5)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Tables (1)

You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (5)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription