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@ARTICLE{Bohn:44367,
      author       = {Bohn, B. and Rohrer, F. and Brauers, T. and Wahner, A.},
      title        = {{A}ctinometric measurements of {NO}2 photolysis frequencies
                      in the atmosphere simulation chamber {SAPHIR}},
      journal      = {Atmospheric chemistry and physics},
      volume       = {5},
      issn         = {1680-7316},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {PreJuSER-44367},
      pages        = {493 - 503},
      year         = {2005},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {The simulation chamber SAPHIR at Forschungszentrum Julich
                      has UV permeable teflon walls facilitating atmospheric
                      photochemistry studies under the influence of natural
                      sunlight. Because the internal radiation field is strongly
                      affected by construction elements, we use external,
                      radiometric measurements of spectral actinic flux and a
                      model to calculate mean photolysis frequencies for the
                      chamber volume (Bohn and Zilken, 2005). In this work we
                      determine NO2 photolysis frequencies j(NO2) within SAPHIR
                      using chemical actinometry by injecting NO2 and observing
                      the chemical composition during illumination under various
                      external conditions. In addition to a photo-stationary
                      approach, a time-dependent method was developed to analyse
                      the data. These measurements had two purposes. Firstly, to
                      check the model predictions with respect to diurnal and
                      seasonal variations in the presence of direct sunlight and
                      secondly to obtain an absolute calibration factor for the
                      combined radiometry-model approach. We obtain a linear
                      correlation between calculated and actinometric j(NO2). A
                      calibration factor of 1.34+/-0.10 is determined, independent
                      of conditions in good approximation. This factor is in line
                      with expectations and can be rationalised by internal
                      reflections within the chamber. Taking into account the
                      uncertainty of the actinometric j(NO2), an accuracy of
                      $13\%$ is estimated for the determination of j(NO2) in
                      SAPHIR. In separate dark experiments a rate constant of
                      (1.93+/-0.12)x10(-14) cm(3) s(-1) was determined for the
                      NO+O-3 reaction at 298K using analytical and numerical
                      methods of data analysis.},
      keywords     = {J (WoSType)},
      cin          = {ICG-II},
      ddc          = {550},
      cid          = {I:(DE-Juel1)VDB48},
      pnm          = {Chemie und Dynamik der Geo-Biosphäre},
      pid          = {G:(DE-Juel1)FUEK257},
      shelfmark    = {Meteorology $\&$ Atmospheric Sciences},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000226995100003},
      url          = {https://juser.fz-juelich.de/record/44367},
}