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Direct monitoring of absorption in solution by cavity ring-down spectroscopy
Alexander J Hallock1, Elena S F Berman, Richard N Zare
1Department of Chemistry, Stanford University, California 94305, USA.
Analytical Chemistry
|May 30, 2002
Abstract:
Cavity ring-down spectroscopy is applied to the liquid phase by placing the target solution directly into the optical cavity. We demonstrate that solutions in the cavity can be stirred and more importantly monitored in a flow. We report a minimum detectable absorption of 10(-6) cm(-1) for a range of organic solvents. This detection limit corresponds to picomolar concentrations for strong absorbers.