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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/amt-2019-507
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2019-507
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 09 Jan 2020

Submitted as: research article | 09 Jan 2020

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This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).

MIMiX: A Multipurpose In-situ Microreactor system for X-ray microspectroscopy to mimic atmospheric aerosol processing

Jan-David Förster1,2, Christian Gurk3, Mark Lamneck3, Haijie Tong1, Florian Ditas1, Sarah S. Steimer4, Peter A. Alpert5, Markus Ammann5, Jörg Raabe6, Markus Weigand7, Benjamin Watts6, Ulrich Pöschl1, Meinrat O. Andreae2,8, and Christopher Pöhlker1,2 Jan-David Förster et al.
  • 1Multiphase Chemistry Department, Max Planck Institute for Chemistry, 55128 Mainz, Germany
  • 2Biogeochemistry Department, Max Planck Institute for Chemistry, 55128 Mainz, Germany
  • 3Instrument Development Group, Max Planck Institute for Chemistry, 55128 Mainz, Germany
  • 4Department of Environmental Sciences, University of Basel, 4001 Basel, Switzerland
  • 5Laboratory of Environmental Chemistry, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
  • 6Laboratory Condensed Matter Physics, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
  • 7Institute for Nanospectroscopy, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, 12489 Berlin, Germany
  • 8Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA 92037, USA

Abstract. The dynamic processing of aerosols in the atmosphere is difficult to mimic under laboratory conditions, particularly on a single particle level with high spatial and chemical resolution. Our new microreactor system for X-ray microscopy facilitates observations under in-situ conditions and extends the accessible parameter ranges of previously reported setups to very high humidities and low temperatures. With the parameter margins for pressure (180–1000 hPa), temperature (−23 °C to room temperature), and relative humidity (~ 0 % to above 98 %), a wide range of tropospheric conditions is covered. Unique features are the mobile design and compact size that make the instrument applicable to different synchrotron facilities. Successful first experiments were conducted at two X-ray microscopes, i) MAXYMUS, located at beamline UE46 synchrotron BESSY II, Berlin, Germany, and ii) PolLux, located at beamline X07DA of the Swiss Light Source in the Paul Scherrer Institute, Villigen, Switzerland. Here we present the design and analytical scope of the system, along with first results from hydration/dehydration experiments on ammonium sulfate and potassium sulfate particles and the observation of water ice at low temperature and high relative humidity in a secondary organic aerosol particle from isoprene oxidation.

Jan-David Förster et al.
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Available data for "MIMiX: A Multipurpose In-situ Microreactor system for X-ray microspectroscopy" J.-D. Förster, C. Gurk, M. Lamneck, Ha. Tong, F. Ditas, S. S. Steimer, P. A. Alpert, M. Ammann, J. Raabe, M. Weigand, B. Watts, U. Pöschl, M. O. Andreae, and C. Pöhlker https://doi.org/10.17617/3.39

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Video supplement for "MIMiX: A Multipurpose In-situ Microreactor system for X-ray microspectroscopy" J.-D. Förster, C. Gurk, M. Lamneck, H. Tong, F. Ditas, S. S. Steimer, P. A. Alpert, M. Ammann, J. Raabe, M. Weigand, B. Watts, U. Pöschl, M. O. Andreae, and C. Pöhlker https://doi.org/10.17617/3.39

Jan-David Förster et al.
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Short summary
A gas flow system coupled with a microreactor for X-ray microspectroscopy is presented. Its core objective is to mimic the atmospheric processing of aerosol particles under laboratory conditions in a controlled gas-phase environment and allow in-situ observations with high spatial and chemical resolution. We here emphasize its analytical capabilities and show initial results from hydration/dehydration experiments and the observation of water ice at low temperature and high relative humidity.
A gas flow system coupled with a microreactor for X-ray microspectroscopy is presented. Its core...
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