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- Title
Trace measurement of BrO at the ppt level by a transportable mode-locked frequency-doubled cavity-enhanced spectrometer.
- Authors
Grilli, R.; Méjean, G.; Kassi, S.; Ventrillard, I.; Abd-Alrahman, C.; Fasci, E.; Romanini, D.
- Abstract
Pptv levels of BrO radical have been detected around 338.5-nm wavelength probing a rotationally structured A←X (7,0) electronic transition using mode-locked cavity-enhanced spectroscopy (ML-CEAS). The spectrometer is composed by a widely tunable, broadband frequency-doubled Ti:Sa mode-locked frequency comb laser injected into a high-finesse optical cavity and a high-resolution spectrometer based on a high-order diffraction grating and a high-sensitivity back-thinned CCD camera. A typical minimum detectable absorption coefficient of 1×10 −9 cm −1 in 30 s of acquisition has been achieved, leading to a detection limit of 1.7 parts per trillion of BrO at atmospheric pressure. The compact and robust ultrasensitive broadband UV spectrometer is intended to be employed for in situ long-term direct measurements of BrO and other halogenated radicals, thus responding to the lack of analytical techniques to monitor the concentrations of such highly chemically reactive species.
- Subjects
BROMINE oxides; SPECTROMETERS; LASERS; DIFFRACTION gratings; RADICALS (Chemistry); CCD cameras; ATMOSPHERIC pressure
- Publication
Applied Physics B: Lasers & Optics, 2012, Vol 107, Issue 1, p205
- ISSN
0946-2171
- Publication type
Article
- DOI
10.1007/s00340-011-4812-9