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@PHDTHESIS{Khattatov:863786,
      author       = {Khattatov, Talat},
      title        = {{D}evelopment, calibration and deployment of an airborne
                      chemical ionization mass spectrometer for trace gas
                      measurements},
      volume       = {464},
      school       = {Univ. Wuppertal},
      type         = {Dissertation},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {FZJ-2019-03777},
      isbn         = {978-3-95806-404-1},
      series       = {Schriften des Forschungszentrums Jülich Reihe Energie $\&$
                      Umwelt / Energy $\&$ Environment},
      pages        = {14, 125},
      year         = {2019},
      note         = {Dissertation, Univ. Wuppertal, 2019},
      abstract     = {Some ultra trace gas species present in the upper
                      troposphere and lower stratosphere(UTLS) region at low
                      part-per-billion and part-per-trillion mixing ratios are
                      known to havea major effect on atmospheric chemistry and
                      climate. Chlorine and bromine species causingstrong ozone
                      depletion and sulfur dioxide (SO$_{2}$) driving aerosol
                      formation processes of high relevance to the global
                      radiative budget are prominent examples. Nitric acid
                      (HNO$_{3}$)is another species, which is quite important for
                      particle formation and denitrification processes. In order
                      to fully understand and reliably model the involved
                      processes for climatepredictions, spatially highly resolved
                      in-situ measurements of these species are needed. Therefore
                      robust instruments are required that can perform very
                      sensitive and accuratemeasurements of ultra-trace species in
                      the extremely challenging UTLS environment from balloons or
                      favorably high-flying aircraft, which impose stringent
                      mechanical and electrical constraints. Here I describe the
                      set-up, test, characterization, deployment, data analysis,
                      and preliminary results of the new FunMass instrument
                      tailored to the deployment on the high-flyingresearch
                      aircraft M-55 Geophysica. FunMass utilizes the established
                      techniques of chemical ionization mass spectrometry (CIMS)
                      in an unprecedented package pairing measurementsensitivity
                      and accuracy with high versatility at reasonable
                      instrumental weight and dimensions. FunMass was set up based
                      on a laboratory prototype [1]: the concept of its
                      transferstage with an ion funnel and its dielectric barrier
                      discharge (DBD) ion source was adapted for the airborne
                      version of the instrument. The ion funnel improves the
                      sensitivity of the instrument at least by one order of
                      magnitude and the DBD ion source is an excellent replacement
                      for the logistically very challenging radioactive ion
                      source, which is widely used for CIMS. A big advantage of
                      the TOF-MS technique for airborne measurements is that it is
                      capable of fast and simultaneous acquisition of full mass
                      spectra and therefore measurements of many different ion
                      species, which is very important since flight hours of
                      research aircraft are a very limited resource [...]},
      cin          = {IEK-7},
      cid          = {I:(DE-Juel1)IEK-7-20101013},
      pnm          = {244 - Composition and dynamics of the upper troposphere and
                      middle atmosphere (POF3-244)},
      pid          = {G:(DE-HGF)POF3-244},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
      url          = {https://juser.fz-juelich.de/record/863786},
}