LACIS, the "Leipzig Aerosol Cloud Interaction Simulator" is used to examine hygroscopic growth and activation and immersion-freezing of aerosol particles and cloud droplets under controlled conditions in the laboratory. These studies improve our understanding and the quantification of the interactions between aerosol particles and clouds.

LACIS measurements are accompanied by a Cloud Condensation Nuclei counter (CCNc, usually the version from Droplet Measurement Technologies), an instrument which also can measure the activation of aerosol particles.

Furthermore, since 2013, a SPIN (Spectrometer for Ice Nuclei) is availlable for the examination of heterogenous freezing processes.

Additionally, we are studying ice crystal growth and the surface roughness of these ice crystalls.