LAboratoire de Spectrochimie Infrarouge et Raman – UMR 8516
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Time-resolved spectroscopy platform

This LASIR’s infrastructure brings together a large pool of equipments and expertises in the domain of transient optical spectroscopy dedicated to the investigation of photophysical and photochemical processes in condensed phase. It includes various types of electronic and vibrational transient spectroscopic setups equipped with a choice of pulsed laser sources (femtosecond, picosecond and nanosecond) covering a wide spectral range (UV to IR). Thanks to such complementary spectroscopic devices and wide temporal range covered, the platform is able to meet chemists and physicochemists requirements in the area of photochemical reactivity, from the understanding of elementary chemical processes to the optimization and functionalization of complex photoactive molecular systems.

Most experiments in this platform are based on the use of the so-called “pump-probe” method which allows direct observation of ultrafast phenomena. In this method, a photo-induced chemical process is triggered at time t=0 by a “pump” laser pulse and the state of the system is detected spectroscopically at time t+Δt by a second “probe” pulse. By repeating the measurement for different delays Δt, the real time evolution of the chemical system can monitored during the whole reaction process.

Contacts

These experimental techniques are coupled with chemometric analysis or molecular modeling tools for spectro-kinetics data interpretation.