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Seminar : Gernot Friedrichs

par Webmestre - publié le , mis à jour le

« Physicochemical Aspects of Ocean-Atmosphere Coupling Studied by VSFG and CRDS techniques. »

Monday, November 18, CERLA

Modern laser techniques such as vibrational sum-frequency generation (VSFG) spectroscopy for surface analysis and cavity-ringdown spectroscopy (CRDS) for ultrasensitive trace gas detect ! ion offer unique insights into environmental phenomena. Selected exampl ! es will be presented to highlight the capabilities of VSFG and CRDS to study the oxidation kinetics of a monolayer of unsaturated fatty acids, to gain a more quantitative understanding of the molecular c ! omposition and structure of the ma ! rine nanolayer - that is a complex layer of organics regularly found at the water-air interface of natural water samples - and to perform continuous field-measurements on the isotopic composition of CO2 dissolved in surface ocean water. The presented data allow conclusions to be drawn about air-sea gas exchange, the composition and reactivity of sea-borne aerosols, and hence ocean-atmosphere coupling.