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Ultrafast electron diffraction

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Ultrafast Electron Diffraction (UED) is a pump-probe experiment method based on electron diffraction from ultrafast electron pulses. The pump laser will inject into the sample to induce the transitions and, after a finite time, another UV laser will hit the photocathode to produce electron pulses. After it passes through the sample, the electron pulse will be scattered and form diffraction patterns on a CCD camera carrying the structural information of the sample. By adjusting the time difference between the pump laser and UV laser, one can obtain a series of diffraction patterns as a function of time, which can be used to examine the dynamics of charge carriers, atoms, and molecules.

Sources

  • Srinivasan, Ramesh; Lobastov, Vladimir A.; Ruan, Chong-Yu; Zewail, Ahmed H. (2003). "Ultrafast Electron Diffraction (UED): A New Development for the 4D Determination of Transient Molecular Structures". Helvetica Chimica Acta. 86 (6): 1761. doi:10.1002/hlca.200390147.
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