Femtosecond x-ray absorption spectroscopy with a laser-driven high-harmonic source is used to map ultrafast changes of x-ray absorption by femtometer-scale coherent phonon displacements. In LiBH, displacements along an phonon mode at 10 THz are induced by impulsive Raman excitation and give rise to oscillatory changes of x-ray absorption at the Li K-edge. Electron density maps from femtosecond x-ray diffraction data show that the electric field of the pump pulse induces a charge transfer from the to neighboring Li ions, resulting in a differential Coulomb force that drives lattice vibrations in this virtual transition state.
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| http://dx.doi.org/10.1103/PhysRevB.95.081101 | DOI Listing |
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