Atmospheric Measurement Techniques Discussions www.atmos-meas-tech-discuss.net 1867-8610 1 1 2008 10.5194/amtd-1-67-2008 http://www.atmos-meas-tech-discuss.net/1/67/2008/ http://www.atmos-meas-tech-discuss.net/1/67/2008/amtd-1-67-2008.html http://www.atmos-meas-tech-discuss.net/1/67/2008/amtd-1-67-2008.pdf 67 102 2008-09-09 A cavity ring down/cavity enhanced absorption device for measurement of ambient NO₃ and N₂O₅ G. Schuster I. Labazan J. N. Crowley crowley@mpch-mainz.mpg.de Max-Planck-Institut für Chemie, Mainz, Germany now at: NXP Semiconductors, Nijmegen, The Netherlands An inexpensive, compact instrument for the sensitive measurement of NO₃ and N₂O₅ in ambient air at high time resolution is described. Light from a red-emitting laser diode (≈662 nm) is coupled off-axis into an optical resonator defined by two highly reflective mirrors to achieve effective absorption paths exceeding 20 km. 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