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@ARTICLE{Emanuelsson:186565,
      author       = {Emanuelsson, Eva U. and Mentel, Thomas F. and Watne, Ågot
                      K. and Spindler, Christian and Bohn, Birger and Brauers,
                      Theo and Dorn, Hans-Peter and Hallquist, Åsa M. and
                      Häseler, Rolf and Kiendler-Scharr, Astrid and Müller,
                      Klaus Peter and Pleijel, Håkan and Rohrer, Franz and
                      Rubach, Florian and Schlosser, Eric and Tillmann, Ralf and
                      Hallquist, Mattias},
      title        = {{P}arameterization of {T}hermal {P}roperties of {A}ging
                      {S}econdary {O}rganic {A}erosol {P}roduced by
                      {P}hoto-{O}xidation of {S}elected {T}erpene {M}ixtures},
      journal      = {Environmental science $\&$ technology},
      volume       = {48},
      number       = {11},
      issn         = {0013-936X},
      address      = {Columbus, Ohio},
      publisher    = {American Chemical Society},
      reportid     = {FZJ-2015-00638},
      pages        = {6168 - 6176},
      year         = {2014},
      abstract     = {Formation and evolution of secondary organic aerosols (SOA)
                      from biogenic VOCs influences the Earth’s radiative
                      balance. We have examined the photo-oxidation and aging of
                      boreal terpene mixtures in the SAPHIR simulation chamber.
                      Changes in thermal properties and chemical composition,
                      deduced from mass spectrometric measurements, were providing
                      information on the aging of biogenic SOA produced under
                      ambient solar conditions. Effects of precursor mixture,
                      concentration, and photochemical oxidation levels (OH
                      exposure) were evaluated. OH exposure was found to be the
                      major driver in the long term photochemical transformations,
                      i.e., reaction times of several hours up to days, of SOA and
                      its thermal properties, whereas the initial concentrations
                      and terpenoid mixtures had only minor influence. The
                      volatility distributions were parametrized using a sigmoidal
                      function to determine TVFR0.5 (the temperature yielding a
                      $50\%$ particle volume fraction remaining) and the steepness
                      of the volatility distribution. TVFR0.5 increased by 0.3 ±
                      $0.1\%$ (ca. 1 K), while the steepness increased by 0.9 ±
                      $0.3\%$ per hour of 1 × 106 cm–3 OH exposure. Thus, aging
                      reduces volatility and increases homogeneity of the vapor
                      pressure distribution, presumably because highly volatile
                      fractions become increasingly susceptible to gas phase
                      oxidation, while less volatile fractions are less reactive
                      with gas phase OH.},
      cin          = {IEK-8},
      ddc          = {050},
      cid          = {I:(DE-Juel1)IEK-8-20101013},
      pnm          = {233 - Trace gas and aerosol processes in the troposphere
                      (POF2-233)},
      pid          = {G:(DE-HGF)POF2-233},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000336952000015},
      doi          = {10.1021/es405412p},
      url          = {https://juser.fz-juelich.de/record/186565},
}