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Issue 10, 2012
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Cavity-enhanced absorption using an atomic line source: application to deep-UV measurements

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Abstract

Optical cavities are commonly used to increase the sensitivity of absorption measurements, but have not been extensively used below 300 nm, mainly owing to the limited light sources at these wavelengths. While some progress has been made using cavity ring-down spectroscopy, these systems rely on complex and expensive lasers. Here we investigate an approach combining Cavity-Enhanced Absorption Spectroscopy (CEAS) with an inexpensive low vapour pressure mercury lamp for sensitive absorption measurements at 253.7 nm. We demonstrate that the CEAS absorption in our system is 50 times greater than the absorption found in a single-pass configuration; using this approach, we obtained limits of detection of 8.1 pptv (66 ng m−3) for gaseous elemental mercury and 8.4 ppbv for ozone. We evaluate the performance of the system and discuss potential improvements and applications of this approach.

Graphical abstract: Cavity-enhanced absorption using an atomic line source: application to deep-UV measurements

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Publication details

The article was received on 02 Feb 2012, accepted on 27 Mar 2012 and first published on 28 Mar 2012


Article type: Communication
DOI: 10.1039/C2AN35149H
Citation: Analyst, 2012,137, 2318-2321
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    Cavity-enhanced absorption using an atomic line source: application to deep-UV measurements

    S. B. Darby, P. D. Smith and D. S. Venables, Analyst, 2012, 137, 2318
    DOI: 10.1039/C2AN35149H

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