Laboratory studies of atmospheric sulfur chemistry using tunable diode laser probes

Robert E. Stickel; S. P. Urbanski; Zhizhong Zhao; Paul H. Wine

doi:10.1117/12.255317

21 October 1996 Laboratory studies of atmospheric sulfur chemistry using tunable diode laser probes

Robert E. Stickel, S. P. Urbanski, Zhizhong Zhao, Paul H. Wine

Proceedings Volume 2834, Application of Tunable Diode and Other Infrared Sources for Atmospheric Studies and Industrial Process Monitoring; (1996) https://doi.org/10.1117/12.255317
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

Abstract

Tunable lead-salt diode laser absorption spectroscopy (TDLAS) provides a sensitive and versatile probe for the study of the kinetics and mechanisms of atmospheric reactions. In our laboratory, the combination of laser flash photolysis with TDLAS detection of reactant and/or product species has proven useful in several studies of the gas phase oxidation of the atmospheric sulfur compound dimethylsulfide, a process which may play an important role in global climate modification/regulation. Typically a radical species is produced by UV laser photolysis of a stable precursor in a slowly flowing mixture of reactant and buffer gases. The concentration of this radical or a selected reaction product is then followed by TDLAS on a time scale of microseconds to milliseconds. This method allows direct determination of reaction rates and product branching ratios over a range of temperature, pressure and reactant concentrations in complete isolation from reactor surfaces.

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Robert E. Stickel, S. P. Urbanski, Zhizhong Zhao, and Paul H. Wine "Laboratory studies of atmospheric sulfur chemistry using tunable diode laser probes", Proc. SPIE 2834, Application of Tunable Diode and Other Infrared Sources for Atmospheric Studies and Industrial Process Monitoring, (21 October 1996); https://doi.org/10.1117/12.255317

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KEYWORDS

Photolysis

Absorption

Chlorine

Atmospheric chemistry

Atmospheric sensing

Modulation

Oxidation

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