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Article Dans Une Revue Applied Physics B - Laser and Optics Année : 2012

Trace measurement of BrO at the ppt level by a transportable mode-locked frequency-doubled cavity-enhanced spectrometer

R. Grilli
S. Kassi
C. Abd-Alrahman
  • Fonction : Auteur
E. Fasci
  • Fonction : Auteur
D. Romanini

Résumé

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.

Dates et versions

hal-00996438 , version 1 (26-05-2014)

Identifiants

Citer

R. Grilli, G. Méjean, S. Kassi, I. Ventrillard, C. Abd-Alrahman, et al.. Trace measurement of BrO at the ppt level by a transportable mode-locked frequency-doubled cavity-enhanced spectrometer. Applied Physics B - Laser and Optics, 2012, 107, pp.205-212. ⟨10.1007/S00340-011-4812-9⟩. ⟨hal-00996438⟩

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