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@PHDTHESIS{Bomeyer:52278,
      author       = {Boßmeyer, Jens},
      title        = {{S}tudies of {A}ldehydes in an {A}tmosphere {S}imulation
                      {C}hamber},
      volume       = {4218},
      issn         = {0944-2952},
      school       = {Univ . Heidelberg},
      type         = {Dr. (Univ.)},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibiothek, Verlag},
      reportid     = {PreJuSER-52278, Juel-4218},
      series       = {Berichte des Forschungszentrums Jülich},
      pages        = {143 p.},
      year         = {2006},
      note         = {Record converted from VDB: 12.11.2012; Heidelberg, Univ .,
                      Diss., 2006},
      abstract     = {In the course of this thesis, a DOAS instrument using a
                      multiple reflection system of the White design was installed
                      at the atmosphere simulation chamber SAPHIR
                      (Forschungszentrum Jülich, Germany). The DOAS instrument
                      allowed to detect $NO_{3}$ at SAPHIR for the first time. A
                      loss process of $NO_{3}$ was identified in the dry chamber
                      and characterised with a lifetime of (42$\pm$4) min. Apart
                      from that, the chamber was used in three ways. (1) The DOAS
                      could be compared to other detection methods under
                      controlled conditions, which was done for the trace gases
                      $NO_{2}, O_{3}, HONO, H_{2}O$, benzene and m-xylene. The
                      agreement between DOAS and the other methods was very good
                      (13 \% maximum deviation in the absolute value, correlation
                      coefficients higher than 0.92). (2) The DOAS could be
                      compared to time profiles of trace gas injections (of
                      benzaldehyde, toluene and HCHO) into the chamber, which were
                      calculated from the sample weight and from fundamental
                      chamber properties. The agreement between the DOAS and the
                      calculations was also good (19 \% maximum deviation, R
                      higher than 0.94). Thus, the scaling of the differential
                      absorption cross section of HCHO used in the DOAS
                      evaluations was confirmed. (3) Measurements of the DOAS and
                      other instruments could be used to validate current
                      chemistry models. The OH reactivity in the sunlit chamber
                      was derived from DOAS measurements of benzene and m-xylene
                      and matched a direct OH measurement excellently. Moreover,
                      the HCHO yield from the ethene-ozone reaction was studied. A
                      discrepancy was observed between a model calculation and the
                      measurement, which originated from the model assumptions
                      made for kinetics of reaction intermediates in the
                      ethene-ozone mechanism. Finally, absolute rate studies of
                      the $NO_{3}$ reaction with ethanal (2.6$\pm$0.5), propanal
                      (5.8$\pm$1.0), butanal (11.9$\pm$1.4) and benzaldehyde
                      (2.2$\pm$0.6, all in cm$^{3}s^{-1}$ at 300 K) corroborated
                      the rate coefficients of current literature recommendations
                      at near-ambient concentration levels. However, the measured
                      yields of the product aldehydes in the $NO_{3}$ reactions
                      with propanal and butanal disagreed with model calculations.
                      This discrepancy originated from the model assumptions made
                      for the kinetics of peroxyacyl nitrates in the degradation
                      mechanism of the aldehydes.},
      cin          = {ICG-II},
      cid          = {I:(DE-Juel1)VDB48},
      pnm          = {Atmosphäre und Klima},
      pid          = {G:(DE-Juel1)FUEK406},
      typ          = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
      url          = {https://juser.fz-juelich.de/record/52278},
}