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@PHDTHESIS{Sedlacek:13477,
      author       = {Sedlacek, Michael},
      title        = {{M}essung der {H}ydroxylradikal-{K}onzentration in der
                      marinen {T}roposphäre mittels laserinduzierter
                      {F}loureszenz},
      volume       = {3848},
      issn         = {0944-2952},
      school       = {Univ. Bonn},
      type         = {Dr. (Univ.)},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {PreJuSER-13477, Juel-3848},
      series       = {Berichte des Forschungszentrums Jülich},
      pages        = {VII, 117 p.},
      year         = {2001},
      note         = {Record converted from VDB: 12.11.2012; Bonn, Univ., Diss.,
                      2000},
      abstract     = {The concentrations of OH and H02 radicals were measured
                      above the Atlantic ocean using LIF technique. The
                      measurements were part of the field campaign ALBATROSS which
                      took place aboard the German research vessel "Polarstern" in
                      October 1996. Numerous diurnal cycles of OH and H02 were
                      recorded in the marine boundary layer between 24° N and
                      32° S latitude . In this background atmosphere the OH
                      concentration proved to be proportional to the photolysis
                      frequency J(O('D)), whereas the H02 concentration correlated
                      with the square root of AO( D)). Furthermore, the
                      calibration method for the LIF experiment was verified and
                      improved. The method is based on the photolysis of water
                      vapour at 185 nm for radical generation and the dissociation
                      of oxygen for irradiation measurement in the flow reactor.
                      The produced radical concentration is proportional to the
                      quotient of the absorption cross sections of both gases . A
                      low-pressure mercury vapour lamp serves as light source.
                      Measurements of the vuv emission spectrum revealed, that the
                      shape of the 185 nm line is highly dependent on the
                      particular lamp used and on its operating conditions. The
                      line turned out to have a red tail which extended as far as
                      200 nm in single cases. The emission profile of the 185 nm
                      line covers several oxygen Schumann-Runge-bands. Therefore,
                      an effective 02 absorption cross section had to be
                      determined for each particular lamp under well defined
                      operating conditions. A thorough reproduction of these
                      experiment specific parameters is required for a reliable
                      field calibration. As literature data for the cross section
                      of water vapour at 185 nm were inconsistent, its value was
                      remeasured . The result, (7,1 ± 0,2) x 10-2° cm2, is in
                      good agreement with the value determined by Cantrell et al.
                      [1997]. In addition, an alternate calibration method was
                      developed which makes use of the photolysis of nitrous oxide
                      in synthetic air to measure the irradiation . The primary
                      product is O(ID), which reacts partly with N20 to form
                      either 02 and N2 or NO. The generated NOconcentration is
                      detected. The branching ratio for the NO channel was
                      determined with an error of 10 $\%.$ For the quantum yield
                      of the spin-forbidden process of direct NO formation from
                      N20 photolysis a new upper limit of 0.24 $\%$ was measured.
                      While the new N20/NOactinometry has about the same accuracy
                      as the oxygen actinometry, the influence of experiment
                      specific parameters as well as the statistical error is very
                      small compared to the conventional method},
      cin          = {ICG-II},
      cid          = {I:(DE-Juel1)VDB48},
      pnm          = {Troposphärische Chemie},
      pid          = {G:(DE-Juel1)FUEK74},
      typ          = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
      url          = {https://juser.fz-juelich.de/record/13477},
}