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@ARTICLE{LopezHilfiker:202787,
      author       = {Lopez-Hilfiker, F. D. and Mohr, C. and Ehn, M. and Rubach,
                      F. and Kleist, E. and Wildt, J. and Mentel, Th. F. and
                      Carrasquillo, A. J. and Daumit, K. E. and Hunter, J. F. and
                      Kroll, J. H. and Worsnop, D. R. and Thornton, J. A.},
      title        = {{P}hase partitioning and volatility of secondary organic
                      aerosol components formed from α-pinene ozonolysis and {OH}
                      oxidation: the importance of accretion products and other
                      low volatility compounds},
      journal      = {Atmospheric chemistry and physics},
      volume       = {15},
      number       = {14},
      issn         = {1680-7324},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2015-04963},
      pages        = {7765 - 7776},
      year         = {2015},
      abstract     = {We measured a large suite of gas- and particle-phase
                      multi-functional organic compounds with a Filter Inlet for
                      Gases and AEROsols (FIGAERO) coupled to a high-resolution
                      time-of-flight chemical ionization mass spectrometer
                      (HR-ToF-CIMS) developed at the University of Washington. The
                      instrument was deployed on environmental simulation chambers
                      to study monoterpene oxidation as a secondary organic
                      aerosol (SOA) source. We focus here on results from
                      experiments utilizing an ionization method most selective
                      towards acids (acetate negative ion proton transfer), but
                      our conclusions are based on more general physical and
                      chemical properties of the SOA. Hundreds of compounds were
                      observed in both gas and particle phases, the latter being
                      detected by temperature-programmed thermal desorption of
                      collected particles. Particulate organic compounds detected
                      by the FIGAERO–HR-ToF-CIMS are highly correlated with, and
                      explain at least 25–50 $\%$ of, the organic aerosol mass
                      measured by an Aerodyne aerosol mass spectrometer (AMS).
                      Reproducible multi-modal structures in the thermograms for
                      individual compounds of a given elemental composition reveal
                      a significant SOA mass contribution from high molecular
                      weight organics and/or oligomers (i.e., multi-phase
                      accretion reaction products). Approximately 50 $\%$ of the
                      HR-ToF-CIMS particle-phase mass is associated with compounds
                      having effective vapor pressures 4 or more orders of
                      magnitude lower than commonly measured monoterpene oxidation
                      products. The relative importance of these accretion-type
                      and other extremely low volatility products appears to vary
                      with photochemical conditions. We present a
                      desorption-temperature-based framework for apportionment of
                      thermogram signals into volatility bins. The
                      volatility-based apportionment greatly improves agreement
                      between measured and modeled gas-particle partitioning for
                      select major and minor components of the SOA, consistent
                      with thermal decomposition during desorption causing the
                      conversion of lower volatility components into the detected
                      higher volatility compounds.},
      cin          = {IEK-8 / IBG-2},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-8-20101013 / I:(DE-Juel1)IBG-2-20101118},
      pnm          = {243 - Tropospheric trace substances and their
                      transformation processes (POF3-243)},
      pid          = {G:(DE-HGF)POF3-243},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000358799000002},
      doi          = {10.5194/acp-15-7765-2015},
      url          = {https://juser.fz-juelich.de/record/202787},
}