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$Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene$

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Noninvasive time-sorting in radio frequency-compressed ultrafast electron diffraction.

Lingrong Zhao, Jun Wu, Zhe Wang

Structural Dynamics (Melville, N.Y.)

|July 30, 2021

Summary

This summary is machine-generated.

We developed a noninvasive time-sorting method for ultrafast electron diffraction (UED) using radio frequency (rf) compressed electron beams. This technique corrects timing jitter, significantly improving temporal resolution for UED experiments.

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Direct Imaging of Laser-driven Ultrafast Molecular Rotation

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Area of Science:

Physics
Materials Science
Chemistry

Background:

Ultrafast electron diffraction (UED) is a powerful technique for studying dynamic processes in materials.
Achieving high temporal resolution in UED is crucial for observing ultrafast phenomena.
Existing methods for temporal characterization often involve invasive procedures or complex setups.

Purpose of the Study:

To demonstrate a noninvasive time-sorting method for ultrafast electron diffraction (UED) experiments.
To improve the temporal resolution of UED by correcting arrival time jitter of electron beams.
To enable the study of ultrafast dynamics with sub-10 fs accuracy.

Main Methods:

Utilizing radio frequency (rf) compressed electron beams.
Correlating electron beam energy with arrival time at the sample.
Implementing a minimal modification to existing UED machine infrastructure.
Applying the method to both keV and MeV UED systems.

Main Results:

Demonstrated a strong correlation between electron beam energy and arrival time after rf compression.
Achieved 35-fs root mean square (rms) timing jitter correction for a ~3 MeV electron beam.
Showcased the potential for sub-10 fs accuracy in keV UED systems with high energy stability.
Successfully retrieved 2.5 THz coherent A1 phonon oscillations in laser-excited Bismuth film.

Conclusions:

The developed time-sorting method offers a noninvasive approach to enhance UED temporal resolution.
This technique significantly overcomes the limitations imposed by inherent timing jitter in UED experiments.
It opens new avenues for investigating ultrafast phenomena with unprecedented precision, including lattice dynamics and coherent phonon behavior.