Speaker
Description
Pulsed electron beams probe the dynamics of matter out of equilibrium with high spatial and temporal resolution. Ultrafast electron diffraction in particular is sensitive to sub-angstrom, sub-picosecond scale atomic motion. To collect all the structural information available in an electron diffraction pattern, the experimentalist must control the angular magnification onto the detector plane. We present a case study demonstrating the advantage of angular magnification: investigating periodic strain in moiré materials. Strain waves with 10 nm wavelength appear in diffraction as satellites closely clustered around brighter Bragg peaks. We describe a quadrupole lens triplet that varies the effective drift distance
Funding Agency
This work was supported by the U.S Department of Energy, awards DE-SC0020144 and DE-SC0017631, and U.S. National Science Foundation Grant PHY-1549132, the Center for Bright Beams.
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