TY - JOUR
KW - spectroscopy
KW - Condensed Matter Physics
KW - Instrumentation
KW - Radiation
AU - K. Siddiqui
AU - D. Durham
AU - F. Cropp
AU - F. Ji
AU - S. Paiagua
AU - Colin Ophus
AU - N. Andresen
AU - L. Jin
AU - J. Wu
AU - S. Wang
AU - X. Zhang
AU - W. You
AU - Margaret Murnane
AU - M. Centurion
AU - X. Wang
AU - D. Slaughter
AU - R. Kaindl
AU - P. Musumeci
AU - Andrew Minor
AU - D. Filippetto
AB - <jats:p>The ability to resolve the dynamics of matter on its native temporal and spatial scales constitutes a key challenge and convergent theme across chemistry, biology, and materials science. The last couple of decades have witnessed ultrafast electron diffraction (UED) emerge as one of the forefront techniques with the sensitivity to resolve atomic motions. Increasingly sophisticated UED instruments are being developed that are aimed at increasing the beam brightness in order to observe structural signatures, but so far they have been limited to low average current beams. Here, we present the technical design and capabilities of the HiRES (High Repetition-rate Electron Scattering) instrument, which blends relativistic electrons and high repetition rates to achieve orders of magnitude improvement in average beam current compared to the existing state-of-the-art instruments. The setup utilizes a novel electron source to deliver femtosecond duration electron pulses at up to MHz repetition rates for UED experiments. Instrument response function of sub-500 fs is demonstrated with &amp;lt; 100 fs time resolution targeted in future. We provide example cases of diffraction measurements on solid-state and gas-phase samples, including both micro- and nanodiffraction (featuring 100 nm beam size) modes, which showcase the potential of the instrument for novel UED experiments.</jats:p>
BT - Structural Dynamics
DO - 10.1063/4.0000203
IS - 6
N2 - <jats:p>The ability to resolve the dynamics of matter on its native temporal and spatial scales constitutes a key challenge and convergent theme across chemistry, biology, and materials science. The last couple of decades have witnessed ultrafast electron diffraction (UED) emerge as one of the forefront techniques with the sensitivity to resolve atomic motions. Increasingly sophisticated UED instruments are being developed that are aimed at increasing the beam brightness in order to observe structural signatures, but so far they have been limited to low average current beams. Here, we present the technical design and capabilities of the HiRES (High Repetition-rate Electron Scattering) instrument, which blends relativistic electrons and high repetition rates to achieve orders of magnitude improvement in average beam current compared to the existing state-of-the-art instruments. The setup utilizes a novel electron source to deliver femtosecond duration electron pulses at up to MHz repetition rates for UED experiments. Instrument response function of sub-500 fs is demonstrated with &amp;lt; 100 fs time resolution targeted in future. We provide example cases of diffraction measurements on solid-state and gas-phase samples, including both micro- and nanodiffraction (featuring 100 nm beam size) modes, which showcase the potential of the instrument for novel UED experiments.</jats:p>
PB - AIP Publishing
PY - 2023
T2 - Structural Dynamics
TI - Relativistic ultrafast electron diffraction at high repetition rates
VL - 10
SN - 2329-7778
ER -