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A transportable spectrometer for in situ and local measurements of iodine monoxide at mixing ratios in the 10-14 range

Guillaume Méjean 1 Roberto Grilli 1 Chadi Abd Alrahman 2 Irène Ventrillard 2 Samir Kassi 2 Daniele Romanini 2
1 LIPhy-LAME
UJF - Université Joseph Fourier - Grenoble 1, LIPhy [2011-2015] - Laboratoire Interdisciplinaire de Physique [Saint Martin d’Hères] [2011-2015]
2 LAME-LIPhy [?-2015] - LAsers, Molécules et Environnement [?-2015]
LIPhy [2011-2015] - Laboratoire Interdisciplinaire de Physique [Saint Martin d’Hères] [2011-2015]
Abstract : We present a robust, compact, and transportable instrument that measures the iodine monoxide atmospheric radical at extremely low concentration, down to 40 ppqv (parts per quadrillion by volume, 1:1015). As nitrogen dioxide is strongly absorbed in the same spectral region it could be simultaneously measured down to 4 pptv (parts per trillion by volume, 1:1012). Relying on ''mode locked cavity-enhanced absorption spectroscopy,'' the instrument makes use of a free-running commercial femtosecond Titane Saphir laser. We demonstrate that this multiplex detection scheme provides shot noise limited spectra for acquisition times as long as 5 min. Moreover, this instrument is very versatile as it can be potentially tuned from the infrared to the ultraviolet (1080-340 nm) to reach various molecular absorptions. It has been recently deployed at the Station Biologique de Roscoff on the North West Atlantic coast of France.
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https://hal.archives-ouvertes.fr/hal-00996499
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Submitted on : Monday, May 26, 2014 - 3:34:28 PM
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Guillaume Méjean, Roberto Grilli, Chadi Abd Alrahman, Irène Ventrillard, Samir Kassi, et al.. A transportable spectrometer for in situ and local measurements of iodine monoxide at mixing ratios in the 10-14 range. Applied Physics Letters, American Institute of Physics, 2012, 100, pp.1110. ⟨10.1063/1.4726190⟩. ⟨hal-00996499⟩

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