Quantitative agreement between dynamical rocking curves in ultrafast electron diffraction for x-ray lasers

Malin, Lucas; Graves, W.; Holl, Mark R.; Spence, John C. H.; Nanni, Emilio A.; Li, R.K.; Shen, Xiaozhe; Weathersby, Stephen

doi:10.1016/j.ultramic.2021.113211

Cited by 2 publications

(3 citation statements)

References 17 publications

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“…A similar approach has been used to model precession electron diffraction (PED), 36 and this approach has been employed by others to account for UED beam divergence. 37 Notably, this is a 2D integral and has significant contributions from near-zone orientations, so it will be more expensive to compute and more sensitive to the sampling than 1D integrals for PED which may avoid sampling near the zone axis.…”

Section: Ued Simulation Methodsmentioning

confidence: 99%

“…1(c-ii) . This distribution can be considered as the convolution of the beam angular spread with the sample rippling such that the RMS tilt spread,

, is given by

is typically on the order of 1 mrad or less for transmission UED setups, 37 and

depends on the sample preparation but can be as much as tens of mrad in some cases. 14 …”

Section: Ued Simulation Methodsmentioning

confidence: 99%

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Accurate quantification of lattice temperature dynamics from ultrafast electron diffraction of single-crystal films using dynamical scattering simulations

Durham

Ophus

Siddiqui

et al. 2022

Structural Dynamics

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In ultrafast electron diffraction (UED) experiments, accurate retrieval of time-resolved structural parameters, such as atomic coordinates and thermal displacement parameters, requires an accurate scattering model. Unfortunately, kinematical models are often inaccurate even for relativistic electron probes, especially for dense, oriented single crystals where strong channeling and multiple scattering effects are present. This article introduces and demonstrates dynamical scattering models tailored for quantitative analysis of UED experiments performed on single-crystal films. As a case study, we examine ultrafast laser heating of single-crystal gold films. Comparison of kinematical and dynamical models reveals the strong effects of dynamical scattering within nm-scale films and their dependence on sample topography and probe kinetic energy. Applying to UED experiments on an 11 nm thick film using 750 keV electron probe pulses, the dynamical models provide a tenfold improvement over a comparable kinematical model in matching the measured UED patterns. Also, the retrieved lattice temperature rise is in very good agreement with predictions based on previously measured optical constants of gold, whereas fitting the Debye–Waller factor retrieves values that are more than three times lower. Altogether, these results show the importance of a dynamical scattering theory for quantitative analysis of UED and demonstrate models that can be practically applied to single-crystal materials and heterostructures.

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Section: Ued Simulation Methodsmentioning

confidence: 99%

“…1(c-ii) . This distribution can be considered as the convolution of the beam angular spread with the sample rippling such that the RMS tilt spread,

, is given by

is typically on the order of 1 mrad or less for transmission UED setups, 37 and

depends on the sample preparation but can be as much as tens of mrad in some cases. 14 …”

Section: Ued Simulation Methodsmentioning

confidence: 99%

Accurate quantification of lattice temperature dynamics from ultrafast electron diffraction of single-crystal films using dynamical scattering simulations

Durham

Ophus

Siddiqui

et al. 2022

Structural Dynamics

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show abstract

“…29 Note that Bragg peak intensity variations are not a direct result from the plasmonic resonance, but are attributed to the difference in angle of incidence of the beam on the sample from shot to shot. 30 All Bragg peaks exhibit the same time-dependent behavior.…”

Section: Introductionmentioning

confidence: 97%

Improved temporal resolution in ultrafast electron diffraction measurements through THz compression and time-stamping

Othman,

Gabriel,

Snively

et al. 2024

Structural Dynamics

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We present an experimental demonstration of ultrafast electron diffraction (UED) with THz-driven electron bunch compression and time-stamping that enables UED probes with improved temporal resolution. Through THz-driven longitudinal bunch compression, a compression factor of approximately four is achieved. Moreover, the time-of-arrival jitter between the compressed electron bunch and a pump laser pulse is suppressed by a factor of three. Simultaneously, the THz interaction imparts a transverse spatiotemporal correlation on the electron distribution, which we utilize to further enhance the precision of time-resolved UED measurements. We use this technique to probe single-crystal gold nanofilms and reveal transient oscillations in the THz near fields with a temporal resolution down to 50 fs. These oscillations were previously beyond reach in the absence of THz compression and time-stamping.

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Quantitative agreement between dynamical rocking curves in ultrafast electron diffraction for x-ray lasers

Cited by 2 publications

References 17 publications

Accurate quantification of lattice temperature dynamics from ultrafast electron diffraction of single-crystal films using dynamical scattering simulations

Accurate quantification of lattice temperature dynamics from ultrafast electron diffraction of single-crystal films using dynamical scattering simulations

Improved temporal resolution in ultrafast electron diffraction measurements through THz compression and time-stamping

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