Atmospheric Measurement Techniques Discussions www.atmos-meas-tech-discuss.net 1867-8610 3 4 2010 10.5194/amtd-3-3803-2010 http://www.atmos-meas-tech-discuss.net/3/3803/2010/ http://www.atmos-meas-tech-discuss.net/3/3803/2010/amtd-3-3803-2010.html http://www.atmos-meas-tech-discuss.net/3/3803/2010/amtd-3-3803-2010.pdf 3803 3849 2010-08-25 In situ detection of atomic and molecular iodine using resonance and off-resonance fluorescence by lamp excitation: ROFLEX J. C. Gómez Martín J. Blahins U. Gross T. Ingham A. Goddard A. S. Mahajan A. Ubelis A. Saiz-Lopez a.saiz-lopez@ciac.jccm-csic.es Laboratory for Atmospheric and Climate Science (CIAC), CSIC, Toledo, Spain Institute for Atomic Physics and Spectroscopy (IAPS), University of Latvia, Latvia School of Chemistry, University of Leeds, Leeds, UK National Centre for Atmospheric Science, School of Chemistry, University of Leeds, UK We demonstrate a new instrument for in situ detection of atmospheric iodine atoms and molecules based on atomic and molecular resonance and off-resonance ultraviolet fluorescence excited by lamp emission. The instrument combines the robustness, light weight, low power consumption and efficient excitation of radio-frequency discharge light sources with the high sensitivity of the photon counting technique. Calibration of I₂ fluorescence is achieved via quantitative detection of the molecule by incoherent broad band cavity-enhanced absorption spectroscopy. 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