Abstract:
:Ultrafast photoinduced electron transfer preceding energy equilibration still poses many experimental and conceptual challenges to the optimization of photoconversion since an atomic-scale description has so far been beyond reach. Here we combine femtosecond transient optical absorption spectroscopy with ultrafast X-ray emission spectroscopy and diffuse X-ray scattering at the SACLA facility to track the non-equilibrated electronic and structural dynamics within a bimetallic donor-acceptor complex that contains an optically dark centre. Exploiting the 100-fold increase in temporal resolution as compared with storage ring facilities, these measurements constitute the first X-ray-based visualization of a non-equilibrated intramolecular electron transfer process over large interatomic distances. Experimental and theoretical results establish that mediation through electronically excited molecular states is a key mechanistic feature. The present study demonstrates the extensive potential of femtosecond X-ray techniques as diagnostics of non-adiabatic electron transfer processes in synthetic and biological systems, and some directions for future studies, are outlined.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Canton SE,Kjær KS,Vankó G,van Driel TB,Adachi S,Bordage A,Bressler C,Chabera P,Christensen M,Dohn AO,Galler A,Gawelda W,Gosztola D,Haldrup K,Harlang T,Liu Y,Møller KB,Németh Z,Nozawa S,Pápai M,Sato T,Sato T,Sudoi
10.1038/ncomms7359subject
Has Abstractpub_date
2015-03-02 00:00:00pages
6359issn
2041-1723pii
ncomms7359journal_volume
6pub_type
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