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

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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.

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Acknowledgements

We are grateful to Jean-Luc Martin for his skilled technical help on several details of the setup. We acknowledge financial support from ANR (Contract ANR-09-BLAN-0016), from our laboratory LIPhy, and finally from the “Reseau Technologique Femtoseconde” of CNRS.

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Authors and Affiliations

  1. Université de Grenoble 1/CNRS, LIPhy UMR 5588, Grenoble, 38041, France

    R. Grilli, G. Méjean, S. Kassi, I. Ventrillard, C. Abd-Alrahman, E. Fasci & D. Romanini

  2. Dipartimento di Scienze Ambientali, Seconda Università di Napoli, via Vivaldi 43, Caserta, 81100, Italy

    E. Fasci

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  1. R. Grilli
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  2. G. Méjean
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  3. S. Kassi
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  5. C. Abd-Alrahman
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  6. E. Fasci
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  7. D. Romanini
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Correspondence to D. Romanini.

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Grilli, R., Méjean, G., Kassi, S. et al. Trace measurement of BrO at the ppt level by a transportable mode-locked frequency-doubled cavity-enhanced spectrometer. Appl. Phys. B 107, 205–212 (2012). https://doi.org/10.1007/s00340-011-4812-9

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  • DOI: https://doi.org/10.1007/s00340-011-4812-9

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