期刊
ZEITSCHRIFT FUR KRISTALLOGRAPHIE
卷 223, 期 4-5, 页码 307-321出版社
WALTER DE GRUYTER GMBH
DOI: 10.1524/zkri.2008.0030
关键词
structural dynamics; intramolecular electron transfer; spin crossover; femtosecond and picosecond X-ray absorption spectroscopy; transition metal compound I; nascent radicals in solution phase
Time-resolved X-ray absorption fine structure (XAFS) spectroscopy with picosecond temporal resolution is a new method to observe electronic and geometric structures of short-lived reaction intermediates. It combines an intense femtosecond laser source synchronized to the X-ray pulses delivered by a synchrotron light source (SLS). We present key experiments on charge transfer reactions as well as spin-crossover processes in coordination chemistry compounds next to solvation dynamics studies of photogenerated atomic radicals. These examples emphasize the observables at hand using ultrafast XAFS techniques, which include the density of states, full and even partial changes in oxidation state, and internuclear distances with milli-Angstrom accuracy. An outlook towards femtosecond studies and biologically relevant systems stresses the high potential of XAFS methods using new femtosecond X-ray sources like free electron lasers (XFELs).
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