上海科技大学知识管理系统

Resonant Auger scattering (RAS) provides informationon the core-valenceelectronic transition and impresses a rich fingerprint of the electronicstructure and nuclear configuration at the time-initiating RAS process.Here, we suggest using a femtosecond X-ray pulse to trigger RAS ina distorted molecule, which is generated from the nuclear evolutionon a valence excited state pumped by a femtosecond ultraviolet pulse.With the time delay varied, the amount of molecular distortion canbe controlled and the RAS measurements imprint both their electronicstructures and changing geometries. This strategy is showcased inH(2)O prepared in an O-H dissociative valence state,where molecular and fragment lines appear in RAS spectra as signaturesof ultrafast dissociation. Given the generality of this approach fora broad class of molecules, this work opens a new alternative pump-probetechnique for mapping the core and valence dynamics with ultrashortX-ray probe pulses.