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

Hauf, Chrıstoph; Salvador, Antonio-Andres Hernandez; Holtz, Marcel; Woerner, M.; Elsaesser, Thomas

doi:10.1063/1.5079229

Cited by 16 publications

(7 citation statements)

References 25 publications

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“…The interplay of soft-mode excitations and changes of electronic charge density has been revealed in femtosecond x-ray diffraction experiments following the transient charge densities in space and time. 85,86 Much less is known on the intrinsic nonlinear response of soft modes, 87 in particular in molecular materials. In the following, we discuss results from 2D-THz spectroscopy which give detailed insight in soft mode nonlinearities in aspirin crystals.…”

Section: Soft-mode Excitations In Polar Molecular Crystalsmentioning

confidence: 99%

Two-dimensional terahertz spectroscopy of condensed-phase molecular systems

Reimann

Woerner

Elsaesser

2021

The Journal of Chemical Physics

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Nonlinear terahertz (THz) spectroscopy relies on the interaction of matter with few-cycle THz pulses of electric field amplitudes up to megavolts/centimeter (MV/cm). In condensed-phase molecular systems, both resonant interactions with elementary excitations at low frequency such as intra-and intermolecular vibrations and nonresonant field-driven processes are relevant. Two-dimensional THz (2D-THz) spectroscopy is a key method for following nonequilibrium processes and dynamics of excitations to decipher the underlying interactions and molecular couplings. This article addresses the state of the art in 2D-THz spectroscopy by discussing the main concepts and illustrating them with recent results. The latter include the response of vibrational excitations in molecular crystals up to the nonperturbative regime of light-matter interaction and field-driven ionization processes and electron transport in liquid water.

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Section: Soft-mode Excitations In Polar Molecular Crystalsmentioning

confidence: 99%

Two-dimensional terahertz spectroscopy of condensed-phase molecular systems

Reimann

Woerner

Elsaesser

2021

The Journal of Chemical Physics

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“…Therefore, use of an appropriate X-ray optic, which collects and (quasi-)collimates the radiation is mandatory to enable this approach [18][19][20][21][22][23] . Successful application of ultrafast Debye-Scherrer diffraction at a laser-plasma based X-ray source has been recently demonstrated by measuring transient changes of electron density for thick (10 -100 µm) powder samples of ionic crystals 21,24,25 .…”

Section: Introductionmentioning

confidence: 99%

Acoustic response of a laser-excited polycrystalline Au-film studied by ultrafast Debye–Scherrer diffraction at a table-top short-pulse x-ray source

et al. 2020

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The transient acoustic response of a free-standing, polycrystalline thin Au film upon femtosecond optical excitation has been studied by time-resolved Debye-Scherrer X-ray diffraction using ultrashort Cu K α X-ray pulses from a laser-driven plasma X-ray source.The temporal strain evolution has been determined from the transient shifts of multiple Bragg diffraction peaks. The experimental data are in good agreement with the results of calculations based on the two-temperature model and an acoustic model assuming uni-axial strain propagation in the laser-excited thin film.

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“…The advent of compact table-top laser-driven pulsed X-ray sources (Korn et al, 2002;Zamponi et al, 2009;Uhlig et al, 2013) has enabled significant progress in time-resolved studies (Rischel et al, 1997;Rousse et al, 2001;Hauf et al, 2019;Lu et al, 2020) using mid-to high-power laser systems (e.g. Batysta et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Implementation of a crossed-slit system for fast alignment of sealed polycapillary X-ray optics

Zymaková¹,

Khakurel²,

Picchiotti³

et al. 2020

J Synchrotron Radiat

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A new modification of a table-top laser-driven water-jet plasma X-ray source has been successfully implemented and commissioned at the Extreme Light Infrastructure (ELI) Beamlines user facility. In order to preserve the broadband nature of the source for spectroscopic experiments, a polycapillary lens was initially chosen as the focusing element. Generally, polycapillary X-ray optics have a narrow photon acceptance angle and small field of view, making alignment complicated and time-consuming. This contribution demonstrates a straightforward, reliable and reproducible procedure for aligning polycapillary focusing optics with broadband X-rays. The method involves a pre-alignment step where two X-ray slits are mounted orthogonally on opposite sides of a 3D-printed cylindrical polycapillary holder. This helps to precisely determine the optical axis of the X-ray beam. Subsequent mounting of the polycapillary in the pre-aligned holder with the slits removed allowed for immediate transmission of the X-ray photons through the optics and has provided a good starting point for fine alignment.

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

Cited by 16 publications

References 25 publications

Two-dimensional terahertz spectroscopy of condensed-phase molecular systems

Two-dimensional terahertz spectroscopy of condensed-phase molecular systems

Acoustic response of a laser-excited polycrystalline Au-film studied by ultrafast Debye–Scherrer diffraction at a table-top short-pulse x-ray source

Implementation of a crossed-slit system for fast alignment of sealed polycapillary X-ray optics

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