Abstract
In this section, we highlight the applicability of femtosecond Kα and Kβ X-ray emission spectroscopy (XES) and X-ray diffuse scattering (XDS) to address the ultrafast excited state dynamics of transition metal-centred molecular systems. XES and XDS are uniquely sensitive to electronic and structural dynamics, respectively, and can be applied simultaneously at hard X-ray free electron laser (XFEL) facilities. The time resolution of transient solution state experiments at XFEL sources is now comparable to the time scale of atomic movement in molecular systems, meaning that the combined experiments can simultaneously extract the excited electronic state cascade and any coherent excited state structural dynamics in both the molecule and surrounding solvent cage.
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