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@ARTICLE{Flores:185510,
      author       = {Flores, J. M. and Zhao, Defeng and Segev, L. and Schlag, P.
                      and Kiendler-Scharr, A. and Fuchs, H. and Watne, Å. K. and
                      Bluvshtein, N. and Mentel, Th. F. and Hallquist, M. and
                      Rudich, Y.},
      title        = {{E}volution of the complex refractive index in the {UV}
                      spectral region in ageing secondary organic aerosol},
      journal      = {Atmospheric chemistry and physics},
      volume       = {14},
      number       = {11},
      issn         = {1680-7324},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2014-06937},
      pages        = {5793 - 5806},
      year         = {2014},
      abstract     = {The chemical and physical properties of secondary organic
                      aerosol (SOA) formed by the photochemical degradation of
                      biogenic and anthropogenic volatile organic compounds (VOC)
                      are as yet still poorly constrained. The evolution of the
                      complex refractive index (RI) of SOA, formed from purely
                      biogenic VOC and mixtures of biogenic and anthropogenic VOC,
                      was studied over a diurnal cycle in the SAPHIR photochemical
                      outdoor chamber in Jülich, Germany. The correlation of RI
                      with SOA chemical and physical properties such as oxidation
                      level and volatility was examined. The RI was retrieved by a
                      newly developed broadband cavity-enhanced spectrometer for
                      aerosol optical extinction measurements in the UV spectral
                      region (360 to 420 nm). Chemical composition and volatility
                      of the particles were monitored by a high-resolution
                      time-of-flight aerosol mass spectrometer, and a volatility
                      tandem differential mobility analyzer. SOA was formed by
                      ozonolysis of either (i) a mixture of biogenic VOC
                      (α-pinene and limonene), (ii) biogenic VOC mixture with
                      subsequent addition of an anthropogenic VOC (p-xylene-d10),
                      or (iii) a mixture of biogenic and anthropogenic VOC. The
                      SOA aged by ozone/OH reactions up to 29.5 h was found to be
                      non-absorbing in all cases. The SOA with p-xylene-d10 showed
                      an increase of the scattering component of the RI correlated
                      with an increase of the O / C ratio and with an increase in
                      the SOA density. There was a greater increase in the
                      scattering component of the RI when the SOA was produced
                      from the mixture of biogenic VOCs and anthropogenic VOC than
                      from the sequential addition of the VOCs after approximately
                      the same ageing time. The increase of the scattering
                      component was inversely correlated with the SOA volatility.
                      Two RI retrievals determined for the pure biogenic SOA
                      showed a constant RI for up to 5 h of ageing. Mass spectral
                      characterization shows the three types of the SOA formed in
                      this study have a significant amount of semivolatile
                      components. The influence of anthropogenic VOCs on the
                      oxygenated organic aerosol as well as the atmospheric
                      implications are discussed.},
      cin          = {IEK-8},
      ddc          = {550},
      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:000337803100030},
      doi          = {10.5194/acp-14-5793-2014},
      url          = {https://juser.fz-juelich.de/record/185510},
}