Heterogeneous chlorine activation on stratospheric aerosols and clouds in the Arctic polar vortex - Wegner, T.; Grooß, J.-U.; von Hobe, M.; Stroh, F.; Sumińska-Ebersoldt, O.; Volk, C. M.; Hösen, E.; Mitev, V.; Shur, G.; Müller, R. (Atmospheric Chemistry and Physics, 2012)