Zuerch Lab
ULTRAFAST OPTICAL & X-RAY SPECTROSCOPY | ULTRAFAST IMAGING | ATTOSCIENCE
Zuerch Lab
ULTRAFAST OPTICAL & X-RAY SPECTROSCOPY | ULTRAFAST IMAGING | ATTOSCIENCE

APEX/HiRES (Ultrafast Electron Diffraction)

Electrons are valuable probes of the structure of materials, as they yield atomic-level detail of the underlying lattice structure. By generating ultrafast bunches of electrons, pump-probe spectroscopy techniques can be used to generate ”molecular movies” of a materials response to an excitation. These capabilities are like those of X-rays in many ways. The crucial differences include the fact that electrons scatter from the entire atomic potential while X-rays scatter from electrons, and the scattering cross section, which is orders of magnitude higher for electrons. This contrast, in conjunction with the closeness of the techniques, makes them excellent complements. The goal of the HiRES project is to utilize this technique for the study of materials with unique and promising properties. Our instrument has the unique capability of producing high energy electrons (MeV) at a high repetition rate (MHz). In addition, we have the capacity to cool samples to 10K, giving us access to otherwise unobservable phases of materials. This project is in collaboration with Lawrence Berkeley National Laboratory staff scientist Daniele Filippetto.

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