Cavity-enhanced absorption using an atomic line source: application to deep-UV measurements
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Date
2012-03
Authors
Darby, Steven B.
Smith, Paul D.
Venables, Dean S.
Journal Title
Journal ISSN
Volume Title
Publisher
Royal Society of Chemistry
Published Version
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.
Description
Keywords
Ring-down spectroscopy , Laser , Ultraviolet , Mercury , Spectra , Liquids , Phase , N2O5 , NO3
Citation
DARBY, S. B., SMITH, P. D. & VENABLES, D. S. 2012. Cavity-enhanced absorption using an atomic line source: application to deep-UV measurements. Analyst, 137, 2318-2321. doi: 10.1039/c2an35149h
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Copyright
© The Royal Society of Chemistry 2012.