MeV-UED - MeV Electron Diffraction for Ultrafast Science Applications

MeV-UED Full Name

SLAC MeV Electron Diffraction for Ultrafast Science Applications (MeV-UED) Facility

Short Description

The MeV-UED facility is a powerful tool for the study of time-resolved, ultrafast atomic & molecular dynamics in chemical and solid-state systems. MeV-UED has been established based on the successful research program established at SLAC using MeV Ultrafast  Electron Diffraction (MeV-UED). This facility has demonstrated the following properties:  high spatial resolution (< 0.5 Å), large momentum-transfer range (0.5 to 12 Å-1), high elastic scattering cross sections, high temporal resolution (< 150 fs FWHM), with the additional benefits of relatively large penetration depths (> 100 nm) and negligible sample damage. See current specifications for the facility.

Since 2014, the SLAC UED instrument has been developing robust methods in the pursuit of time-resolved measurements to control and understand molecular structural dynamics and the coupling of electronic and nuclear motions in a variety of material and chemical systems. Driven by a broad array of collaborating teams at SLAC and around the world, the UED instrument has produced an impressive array of high impact publications. Examples range from imaging the motions of monolayer MoS2 , to atomic level movies of light-induced structural distortion in perovskites solar cells, along with molecular movies of chemical bond breaking, ring-opening, and nuclear wavepacket at conical intersections in isolated molecules. MeV-UED has also successfully explored various diffuse scattering and warm dense matter physics applications.

Call for Proposals

Leveraging these successes, and taking advantage of recent system-level improvements in reliability, SLAC is pleased to announce MeV-UED’s first External User experimental time ("Run 1") in mid 2019.

In Run 1, MeV-UED will offer two experimental configurations (see Endstations and Specifications): one solid state/materials and one gas phase chemistry setup. The intent of these configurations is to maximize scientific beamtime by minimizing the downtime for switching, setting up, and testing disparate configurations.

Proposals will be considered on a case by case basis if the requested experimental parameters fall outside of the defined capabilities. For more information, please contact the MeV-UED staff.