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Femtosecond time-resolved X-ray absorption spectroscopy by a multichannel spectral detection using a hard X-ray free electron laser

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Abstract

We have performed the first time-resolved X-ray absorption spectroscopy using the SPring-8 Angstrom Compact Free Electron laser (SACLA) with a dual X-ray beam dispersive detection method. The test compound is aqueous 0.5 M ammonium iron(III) oxalate trihydrate solution. The photoexcited iron complex exhibits a red shifted iron K-edge with a rise time constant of 260 fs. The X-ray absorption difference spectra between the presence and absence of pump pulses are independent of time delay between 1.5 and 100 ps, indicating that the photoexcited species is long-lived.

© 2014 Optical Society of America

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