TY - JOUR
T1 - Time-resolved X-ray absorption spectroscopy
T2 - Watching atoms dance
AU - Milne, Chris J.
AU - Pham, Van Thai
AU - Gawelda, Wojciech
AU - Van Der Veen, Renske M.
AU - ElNahhas, Amal
AU - Johnson, Steven L.
AU - Beaud, Paul
AU - Ingold, Gerhard
AU - Lima, Frederico
AU - Vithanage, Dimali A.
AU - Benfatto, Maurizio
AU - Grolimund, Daniel
AU - Borca, Camelia
AU - Kaiser, Maik
AU - Hauser, Andreas
AU - Abela, Rafael
AU - Bressler, Christian
AU - Chergui, Majed
PY - 2009
Y1 - 2009
N2 - 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 . In addition an analysis technique using the reduced χ2 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.
AB - 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 . In addition an analysis technique using the reduced χ2 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.
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U2 - 10.1088/1742-6596/190/1/012052
DO - 10.1088/1742-6596/190/1/012052
M3 - Article
AN - SCOPUS:73349090928
SN - 1742-6588
VL - 190
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
M1 - 012052
ER -