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@ARTICLE{Mensah:17086,
      author       = {Mensah, A.A. and Buchholz, A. and Mentel, T.F. and
                      Tillmann, R. and Kiendler-Scharr, A.},
      title        = {{A}erosol mass spectrometric measurements of stable crystal
                      hydrates of oxalates and inferred relative ionization
                      efficiency of water},
      journal      = {Journal of aerosol science},
      volume       = {42},
      issn         = {0021-8502},
      address      = {Amsterdam},
      publisher    = {Elsevier},
      reportid     = {PreJuSER-17086},
      pages        = {11 - 19},
      year         = {2011},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {We investigated the crystal hydrates of ammonium oxalate,
                      potassium oxalate and oxalic acid as well as sodium oxalate.
                      By taking advantage of the different crystal water contents
                      we determined for the first time the relative ionization
                      efficiency of water (RIEH2O) in an Aerodyne Aerosol Mass
                      Spectrometer (AMS). The RIE is a key parameter for the
                      quantitative measurement of a compounds' aerosol particle
                      concentration with an AMS. Since the liquid water content of
                      an aerosol particle determines its physical and chemical
                      properties to a large extent, the knowledge of the water
                      content is of high scientific interest. The investigation of
                      the three salts led to a RIEH2O of 2. Application of this
                      RIEH2O and further analysis of oxalic acid revealed two
                      major characteristics, which need to be considered in future
                      when handling oxalic acid. First, oxalic acid aerosol
                      particles show a reduced crystal water content compared to
                      the thermodynamically stable and expected value when
                      produced under standard laboratory conditions. Second, solid
                      oxalic acid and its solutions show significant contamination
                      with ammonium when exposed to atmospheric air. These
                      findings were verified by high resolution mass spectrometry
                      and their implications for laboratory studies of hygroscopic
                      growth and CCN properties of oxalic acid are discussed. (C)
                      2010 Elsevier Ltd. All rights reserved.},
      keywords     = {J (WoSType)},
      cin          = {IEK-8},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IEK-8-20101013},
      pnm          = {Atmosphäre und Klima},
      pid          = {G:(DE-Juel1)FUEK491},
      shelfmark    = {Engineering, Chemical / Environmental Sciences /
                      Meteorology $\&$ Atmospheric Sciences},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000286960200002},
      doi          = {10.1016/j.jaerosci.2010.10.003},
      url          = {https://juser.fz-juelich.de/record/17086},
}