The X-ray Pump–Probe instrument at the Linac Coherent Light Source

Chollet, M.; Alonso-Mori, R.; Cammarata, M.; Damiani, D.; Defever, J.; Delor, J.T.; Feng, Y.; Glownia, J.M.; Langton, J.B.; Nelson, S.; Ramsey, K.; Robert, A.; Sikorski, M.; Song, S.; Stefanescu, D.; Srinivasan, V.; Zhu, D.; Lemke, H.T.; Fritz, D.M.

doi:10.1107/S1600577515005135

Journal of Synchrotron Radiation Journal of
Synchrotron Radiation

IUCr IT WDC

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Figure 3
Spectroscopic pump–probe results from the photoexcited spin transition of [Fe^II(bpy)₃]²⁺ in solution. After excitation into the MLCT state, transition into the HS ⁵T₂ state [inset (c)] causes an increase of the Fe-to-ligand distance [inset (a)]. This structural change is tracked by the XANES trace at 7125 eV [(a), black symbols, vertically offset by 0.5]. The structural HS rise has been fitted by an exponential rise of 162 ± 6 fs (Lemke et al., 2013

). (b) Time-dependent Kβ emission difference spectra. The transient traces at 7061 eV and 7054 eV have been extracted [(a) green diamond symbols and (c) black symbols, respectively]. The data have been overlaid with results from global fits including (blue lines) and excluding (green dashed lines) population of and intermediate ³T triplet state (Zhang et al., 2014