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- W2027780422 abstract "The interplay of vibrational motion and electronic charge relocation in an ionic hydrogen-bonded crystal is mapped by X-ray powder diffraction with a 100 fs time resolution. Photoexcitation of the prototype material KH 2 PO 4 induces coherent low-frequency motions of the PO 4 tetrahedra in the electronically excited state of the crystal while the average atomic positions remain unchanged. Time-dependent maps of electron density derived from the diffraction data demonstrate an oscillatory relocation of electronic charge with a spatial amplitude two orders of magnitude larger than the underlying vibrational lattice motions. Coherent longitudinal optical and tranverse optical phonon motions that dephase on a time scale of several picoseconds, drive the charge relocation, similar to a soft (transverse optical) mode driven phase transition between the ferro- and paraelectric phase of KH 2 PO 4 ." @default.
- W2027780422 created "2016-06-24" @default.
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- W2027780422 date "2012-03-19" @default.
- W2027780422 modified "2023-10-10" @default.
- W2027780422 title "Ultrafast large-amplitude relocation of electronic charge in ionic crystals" @default.
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- W2027780422 doi "https://doi.org/10.1073/pnas.1108206109" @default.
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