We do lab experiments to investigate processes of trace gases on surfaces. Usually we build up flow systems, dose the trace gas of interest to the carrier gas, expose it to a surface and measure the uptake or reaction of this trace gas. We do this either by detecting the loss of a species in the gas phase or its appearance on the surface of interest (coated flow tube, aerosol particle suspended in air, packing of a chromatographic column).
More recently we have started to also observe changed of the surface upon interaction with trace gases. For this we use mostly synchrotron light to investigate the surface substrate in situ, for example at PSI's SLS.

Besides the standard gas phase analysis tools and aerosol techniques, we do have several high-end instruments:

PROTRAC facility to produce radioactive labelled molecules	Motivation !!	Snow diffusion chamber
Chemical Ionisation Mass Spectrometer	Environmental micro-chamber at SLS	Irradiated Flow tube