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    Université de Fribourg

    An in situ cell to study phase transitions in individual aerosol particles on a substrate using scanning transmission x-ray microspectroscopy

    Huthwelker, T. ; Zelenay, V. ; Birrer, M. ; Krepelova, A. ; Raabe, J. ; Tzvetkov, G. ; Vernooij, Martine G. C. ; Ammann, M.

    In: Review of Scientific Instruments, 2011, vol. 81, no. 11, p. 3494604

    A new in situ cell to study phase transitions and chemical processes on individual aerosol particles in the x-ray transmission microscope at the PolLux beamline of the Swiss light source has been built. The cell is machined from stainless steel and aluminum components and is designed to be used in the standard mount of the microscope without need of complicated rearrangements of the microscope....

    Université de Fribourg

    On source identification and alteration of single diesel and wood smoke soot particles in the atmosphere; an X-ray microspectroscopy study

    Vernooij, Martine G. C. ; Mohr, M. ; Tzvetkov, G. ; Zelenay, V. ; Huthwelker, T. ; Kaegi, R. ; Gehrig, R. ; Grobéty, Bernard

    In: Environmental Science and Technology, 2009, vol. 43, no. 14, p. 5339–5344

    Diesel and wood combustion are major sources of carbonaceous particles in the atmosphere. It is very hard to distinguish between the two sources by looking at soot particle morphology, but clear differences in the chemical structure of single particles are revealed by C(1s) NEXAFS (near edge X-ray absorption fine structure) microspectroscopy. Soot from diesel combustion has a dominant spectral...