Issue 10, 2012

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

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

Article information

Article type
Communication
Submitted
02 Feb 2012
Accepted
27 Mar 2012
First published
28 Mar 2012

Analyst, 2012,137, 2318-2321

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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