Abstract
A real-time, noninvasive approach for detecting trace amounts of vapor-phase mercuric chloride in combustion flue gas is demonstrated using a near-infrared pulsed fiber amplifier that is frequency converted to the ultraviolet. Excitation of the transition at generates emission from the photoproduct that is proportional to the concentration of . A measured quadratic dependence of the photofragment emission (PFE) signal on the laser irradiance indicates that the photodissociation process involves two-photon excitation. Additionally, low concentrations of 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
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