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@ARTICLE{Wagner:46353,
      author       = {Wagner, R. and Naumann, K.-H. and Mangold, A. and Möhler,
                      O. and Saathoff, H. and Schurath, U.},
      title        = {{A}erosol chamber study of optical constants and {N}2{O}5
                      uptake on supercooled {H}2{SO}4/{H}2{O}/{HNO}3 solution
                      droplets at polar stratospheric cloud temperatures},
      journal      = {The journal of physical chemistry / A},
      volume       = {109},
      issn         = {1089-5639},
      address      = {Washington, DC},
      publisher    = {Soc.},
      reportid     = {PreJuSER-46353},
      pages        = {8140 - 8148},
      year         = {2005},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {The mechanism of the formation of supercooled ternary
                      H(2)SO(4)/H(2)O/HNO(3) solution (STS) droplets in the polar
                      winter stratosphere, i.e., the uptake of nitric acid and
                      water onto background sulfate aerosols at T < 195 K, was
                      successfully mimicked during a simulation experiment at the
                      large coolable aerosol chamber AIDA of Forschungszentrum
                      Karlsruhe. Supercooled sulfuric acid droplets, acting as
                      background aerosol, were added to the cooled AIDA vessel at
                      T = 193.6 K, followed by the addition of ozone and nitrogen
                      dioxide. N(2)O(5), the product of the gas phase reaction
                      between O(3) and NO(2), was then hydrolyzed in the liquid
                      phase with an uptake coefficient gamma(N(2)O(5)). From this
                      experiment, a series of FTIR extinction spectra of STS
                      droplets was obtained, covering a broad range of different
                      STS compositions. This infrared spectra sequence was used
                      for a quantitative test of the accuracy of published
                      infrared optical constants for STS aerosols, needed, for
                      example, as input in remote sensing applications. The
                      present findings indicate that the implementation of a
                      mixing rule approach, i.e., calculating the refractive
                      indices of ternary H(2)SO(4)/H(2)O/HNO(3) solution droplets
                      based on accurate reference data sets for the two binary
                      H(2)SO(4)/H(2)O and HNO(3)/H(2)O systems, is justified.
                      Additional model calculations revealed that the uptake
                      coefficient gamma(N(2)O(5)) on STS aerosols strongly
                      decreases with increasing nitrate concentration in the
                      particles, demonstrating that this so-called nitrate effect,
                      already well-established from uptake experiments conducted
                      at room temperature, is also dominant at stratospheric
                      temperatures.},
      keywords     = {J (WoSType)},
      cin          = {ICG-I},
      ddc          = {530},
      cid          = {I:(DE-Juel1)VDB47},
      pnm          = {Chemie und Dynamik der Geo-Biosphäre},
      pid          = {G:(DE-Juel1)FUEK257},
      shelfmark    = {Chemistry, Physical / Physics, Atomic, Molecular $\&$
                      Chemical},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:16834200},
      UT           = {WOS:000231809400010},
      doi          = {10.1021/jp0513364},
      url          = {https://juser.fz-juelich.de/record/46353},
}