Phonon driven charge dynamics in polycrystalline acetylsalicylic acid mapped by ultrafast x-ray diffraction | Zendy

Chrıstoph Hauf | Zendy; Antonio-Andres Hernández Salvador | Zendy; Marcel Holtz | Zendy; M. Woerner | Zendy; Thomas Elsaesser | Zendy

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Phonon driven charge dynamics in polycrystalline acetylsalicylic acid mapped by ultrafast x-ray diffraction

Author(s) -

Chrıstoph Hauf,

Antonio-Andres Hernández Salvador,

Marcel Holtz,

M. Woerner,

Thomas Elsaesser

Publication year - 2019

Publication title -

structural dynamics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.415

H-Index - 29

ISSN - 2329-7778

DOI - 10.1063/1.5079229

Subject(s) - phonon , femtosecond , excitation , crystallite , diffraction , charge (physics) , terahertz radiation , x ray , condensed matter physics , materials science , atomic physics , crystallography , physics , molecular physics , chemistry , optics , laser , quantum mechanics

The coupled lattice and charge dynamics induced by phonon excitation in polycrystalline acetylsalicylic acid (aspirin) are mapped by femtosecond x-ray powder diffraction. The hybrid-mode character of the 0.9 ± 0.1 THz methyl rotation in the aspirin molecules is evident from collective charge relocations over distances of some 100 pm, much larger than the sub-picometer nuclear displacements. Oscillatory charge relocations around the methyl group generate a torque on the latter, thus coupling electronic and nuclear motions.

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