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Proceedings Paper

Transient absorption spectroscopy using the super-ACO storage ring FEL
Author(s): Eric Renault; Laurent Nahon; Daniele Nutarelli; David Garzella; F. Merola; Marie-Emmanuelle Couprie
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Paper 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.

Paper Details

Date Published: 28 April 2000
PDF: 11 pages
Proc. SPIE 3925, Biomedical Applications of Free-Electron Lasers, (28 April 2000); doi: 10.1117/12.384262
Show Author Affiliations
Eric Renault, Univ. Paris-Sud and CEA Saclay (France)
Laurent Nahon, Univ. Paris-Sud and CEA Saclay (France)
Daniele Nutarelli, Univ. Paris-Sud and CEA Saclay (France)
David Garzella, Univ. Paris-Sud and CEA Saclay (France)
F. Merola, Univ. Paris-Sud (France)
Marie-Emmanuelle Couprie, Univ. Paris-Sud and CEA Saclay (France)

Published in SPIE Proceedings Vol. 3925:
Biomedical Applications of Free-Electron Lasers
Glenn S. Edwards; John Clark Sutherland, Editor(s)

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