Peer-Reviewed Journal Details
Mandatory Fields
Darby, SB,Smith, PD,Venables, DS
2012
January
Analyst
Cavity-enhanced absorption using an atomic line source: application to deep-UV measurements
Validated
WOS: 11 ()
Optional Fields
RING-DOWN SPECTROSCOPY LASER ULTRAVIOLET MERCURY SPECTRA LIQUIDS PHASE N2O5 NO3
137
2318
2321
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.
http://hdl.handle.net/10468/786
10.1039/c2an35149h
Grant Details