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. We report on applications of the ultraviolet-light-emitting-diode-based incoherent broadband cavity-enhanced absorption spectroscopy(UV-LED-IBBCEAS) technique for optical monitoring of HONO, NO2 andCH2O in a simulation chamber. Performance intercomparison ofUV-LED-IBBCEAS with a wet chemistry-based NitroMAC sensor and a Fourier transform infrared (FTIR)spectrometer has been carried out on real-time simultaneous measurement ofHONO, NO2 and CH2O concentrations during the reaction of NO2with H2O vapour in CESAM (French acronym for Experimental Multiphasic Atmospheric Simulation Chamber). The 1σ(signal-to-noise ratio (SNR) = 1) detection limits of 112 pptv for NO2, 56 pptv for HONO and 41 ppbv for CH2O over 120 s were found for the UV-LED-IBBCEAS measurement.On the contrary to many set-ups where cavities are installed outside thesimulation chamber, we describe here an original in situ permanentinstallation. The intercomparison results demonstrate that IBBCEAS is a verywell suitable technique for in situ simultaneous measurements of multiplechemically reactive species with high sensitivity and high precision even ifthe absorption bands of these species are overlapped. It offers excellentcapacity for non-invasive optical monitoring of chemical reactions without anyperturbation. For the application to simulation chambers, it has theadvantage to provide a spatially integrated measurement across the reactorand hence to avoid point-sampling-related artefacts.

atmospheric measurement techniques

Intercomparison of IBBCEAS, NitroMAC and FTIR analyses for HONO, NO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; and CH&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;O measurements during the reaction of NO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; with H&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;O vapour in the simulation chamber CESAM