Research Group Prof. Dr. G. Friedrichs

Towards a more quantitative understanding of the marine organic nanolayer

The water-air interface of natural marine surface water is known to be covered by a complex mixt. of surface-active substances representing the org. nanolayer.  Similarly, due to their generation by bubble bursting processes within the oceanic microlayer, sea-borne aerosols are heavily enriched with org. compds. just as well.  The resulting thin surface films play an important role for gas exchange and aerosol aging.  In this work, surface sensitive vibrational sum-frequency generation spectroscopy (VSFG) is used to gain a quant. understanding of nanolayer compn. and reactivity on a mol. scale.  New results of a methodical approach including time-series measurements of natural nanolayers, spectra interpretation based on VSFG investigations of proxy films, and a reactivity assessment by applying VSFG as a time-resolved detection tool will be presented.  A special focus is set on the role of carbohydrate contg. material and ozone oxidn. reactions of unsatd. fatty acids.