Time-resolved x-ray absorption spectroscopy: Watching atoms dance

The introduction of pump-probe techniques to the field of x-ray absorption spectroscopy (XAS) has allowed the monitoring of both structural and electronic dynamics of disordered systems in the condensed phase with unprecedented accuracy, both in time and in space. We present results on the electronically excited high-spin state structure of an Fe(II) molecular species, [Fe-II(bpy)(3)](2+), in aqueous solution, resolving the Fe-N bond distance elongation as 0.2 angstrom. In addition an analysis technique using the reduced chi(2) goodness of fit between FEFF EXAFS simulations and the experimental transient absorption signal in energy space has been successfully tested as a function of excited state population and chemical shift, demonstrating its applicability in situations where the fractional excited state population cannot be determined through other measurements. Finally by using a novel ultrafast hard x-ray 'slicing' source the question of how the molecule relaxes after optical excitation has been successfully resolved using femtosecond XANES.


Published in:
14Th International Conference On X-Ray Absorption Fine Structure (Xafs14), Proceedings, 190, -
Presented at:
14th International Conference on X-Ray Absorption Fine Structure (XAFS14), Camerino, ITALY, Jul 26-31, 2009
Year:
2009
Publisher:
Iop Publishing Ltd, Dirac House, Temple Back, Bristol Bs1 6Be, England
Keywords:
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 Record created 2010-11-30, last modified 2018-03-17

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