Transient absorption spectroscopy using the super-ACO storage ring FEL

Eric Renault; Laurent Nahon; Daniele Nutarelli; David Garzella; F. Merola; Marie-Emmanuelle Couprie

doi:10.1117/12.384262

28 April 2000 Transient absorption spectroscopy using the super-ACO storage ring FEL

Eric Renault, Laurent Nahon, Daniele Nutarelli, David Garzella, F. Merola, Marie-Emmanuelle Couprie

Proceedings Volume 3925, Biomedical Applications of Free-Electron Lasers; (2000) https://doi.org/10.1117/12.384262
Event: BiOS 2000 The International Symposium on Biomedical Optics, 2000, San Jose, CA, United States

Abstract

The Super-ACO storage ring FEL is operating with a high average power in the UV range (300 mW at 350 nm), and recently at wavelengths down to 300 nm. In addition this source exhibits high stability and long lifetime which makes it a unique tool for user applications. The coupling of the FEL with other synchrotron based sources (bending magnet and undulator) opens many unexplored possibilities for various types of two-color time-resolved spectroscopies. Presently, we are developing a two-color experiment where we study the sub-nanosecond time-resolved absorption of different chromophoric compounds. In this type of pump-probe experiments, the intense UV pulse of the Super-ACO FEL is used to prepare a high initial concentration of chromophores in their first singlet electronic excited state. The nearby bending magnet synchrotron radiation provides on the other hand a pulsed, white light continuum ranging from UV to IR, which is naturally synchronized with the FEL pulses and can be used to probe the photochemical subsequent events and the transient species. With a dye molecule (POPOP), we have obtained a two-color effect which demonstrates the feasibility of the experiment in terms of flux. Applications on various chromophores of biological interest are planned.

Citation Download Citation

Eric Renault, Laurent Nahon, Daniele Nutarelli, David Garzella, F. Merola, and Marie-Emmanuelle Couprie "Transient absorption spectroscopy using the super-ACO storage ring FEL", Proc. SPIE 3925, Biomedical Applications of Free-Electron Lasers, (28 April 2000); https://doi.org/10.1117/12.384262

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