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@PHDTHESIS{Gkatzelis:845400,
      author       = {Gkatzelis, Georgios},
      title        = {{G}as-to-{P}article {P}artitioning of {M}ajor {O}xidation
                      {P}roducts from {M}onoterpenes and {R}eal {P}lant
                      {E}missions},
      volume       = {417},
      school       = {Universität Köln},
      type         = {Dissertation},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {FZJ-2018-02671},
      isbn         = {978-3-95806-314-3},
      series       = {Schriften des Forschungszentrums Jülich Reihe Energie $\&$
                      Umwelt / Energy $\&$ Environment},
      pages        = {xii, 128 S.},
      year         = {2018},
      note         = {Universität Köln, Diss., 2017},
      abstract     = {Secondary organic aerosol (SOA), formed through the
                      oxidation of volatile organic compounds (VOCs) in the
                      atmosphere, play a key role in climate change and air
                      quality. Due to thousands of individual compounds involved
                      in SOA formation, the chemical characterization of organic
                      aerosols (OA) remains a huge analytical challenge. Defining
                      the fundamental parameters that distribute these organic
                      molecules between the gas and particle phases is essential,
                      as atmospheric lifetime and their impacts change drastically
                      depending on their phase state. In this work, an instrument
                      called aerosol collection module (ACM) was redeveloped and
                      automated to allow a better characterization of SOA
                      originating from the oxidation of biogenic precursors. An
                      inter-comparison of the ACM to different aerosol chemical
                      characterization techniques was performed with a focus on
                      the partitioning of major biogenic oxidation products
                      between the gas- and particle-phase. In particular, the ACM,
                      the collection thermal desorption unit (TD) and the chemical
                      analysis of aerosol on-line (CHARON) are different aerosol
                      sampling inlets utilizing a Proton-Transfer-Reaction Timeof-
                      Flight Mass Spectrometer (PTR-ToF-MS). These techniques were
                      deployed at the atmosphere simulation chamber SAPHIR to
                      study SOA formation and aging from different monoterpenes
                      (β-pinene, limonene) and real plant emissions
                      ($\textit{Pinus sylvestris L.}$). The capabilities of the
                      PTR-based techniques were compared among each other and to
                      results from an Aerodyne Aerosol Mass Spectrometer (AMS) and
                      a Scanning Mobility Particle Sizer (SMPS). Gas-to-particle
                      partitioning values were determined based on the saturation
                      mass concentration (C*) of individual ions by performing
                      simultaneous measurement of their signal in the gas- and
                      particle-phase. Despite significant differences in the
                      aerosol collection and desorption methods of the PTR based
                      techniques, the determined chemical composition was
                      comparable, i.e. the same major contributing ions were found
                      by all instruments for the different chemical systems
                      studied. These ions could be attributed to known products
                      expected from the oxidation of the examined monoterpenes.
                      Averaged over all experiments, the total aerosol mass
                      recovery compared to an SMPS was 80 ± 10\%, 51 ± 5\% and
                      27 ± 3\% for CHARON, ACM and TD, respectively. Comparison
                      to the oxygen to carbon ratios (O:C) obtained by AMS showed
                      that all PTR based techniques observed lower O:C ratios
                      indicating a loss of molecular oxygen either during aerosol
                      sampling or detection. Differences in total mass recovery
                      and O:C between the three instruments was found to result
                      predominately from differences in the electric field
                      strength (V cm$^{-1}$) to buffer gas density (molecules
                      cm$^{-3}$) (E/N) ratio in the drifttube reaction ionization
                      chambers of the PTR-ToF-MS instruments and from
                      dissimilarities in the collection/desorption of aerosols. A
                      method to identify and exclude ions affected by thermal
                      dissociation during desorption and ionic dissociation in the
                      ionization chamber of the PTRMS was developed and tested.
                      Determined species were mapped onto the two dimensional
                      volatility basis set (2D-VBS) and results showed a decrease
                      of the C* with increasing oxidation state. For compounds
                      measured [...]},
      cin          = {IEK-8},
      cid          = {I:(DE-Juel1)IEK-8-20101013},
      pnm          = {899 - ohne Topic (POF3-899)},
      pid          = {G:(DE-HGF)POF3-899},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
      urn          = {urn:nbn:de:0001-2018050951},
      url          = {https://juser.fz-juelich.de/record/845400},
}