Speaker
Prof.
Toshinori Suzuki
(Kyoto University)
Description
We present time-resolved X-ray absorption spectroscopy (TRXAS) of aqueous solutions using a hard X-ray free electron laser (SACLA: SPring-8 Angstrom Compact Free Electron Laser). An aqueous solution of [Fe(III)(C2O4)3]3- is photoexcited by a femtosecond 266 nm pulse, and transient X-ray absorption spectra were measured as a function of pump-probe delay time. The Fe K-edge exhibited an instantaneous red-shift upon 266 nm photoexcitation followed by a slight blue shift within 2 ps and remained unchanged over 100 ps. The X-ray fluorescence method offers higher sensitivity than a direct absorption method [Obara et al. Optics Express, 22, 1105 (2014)] and enables TRXAS at one order of magnitude lower sample concentration. Comparison with TDDFT calculations of the K-edges of the product candidates reveals that the most likely products within 100 ps are [Fe(II)(C2O4)2]- or [Fe(III)(C2O4)2]2-.
Author
Prof.
Toshinori Suzuki
(Kyoto University)
