LCLS MeV-UED
LCLS Megaelectronvolt Ultrafast Electron Diffraction Instrument: MeV-UED
Short Description
The MeV-UED instrument, part of the LCLS User Facility, is a powerful "electron camera" for the study of time-resolved, ultrafast atomic & molecular dynamics in chemical and solid-state systems. MeV-UED operations have been established based on the successful MeV electron diffraction research program at SLAC. This instrument 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. See Intro to MeV-UED video.
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 MeV-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.
Proposals Calls
The MeV-UED instrument, part of the Linac Coherent Light Source (LCLS) user facility at SLAC National Accelerator Laboratory encourages scientists from diverse fields to propose experiments utilizing the MeV-UED's unique capabilities. Access to MeV-UED is open to the international community. There is no cost to submit proposals or conduct experiments at MeV-UED. However, users are responsible for their own travel expenses and (in rare cases) for any extraordinary consumables required by the experiment. Please refer to the MeV-UED proposals page for information on the currently offered instruments, and the proposal review process prior to writing your proposal.
MeV-UED Liquid Phase Early Science
The LCLS MeV-UED will begin it liquid-phase early science program on August 7th 2024.
In discussions with the user community, four experiments were selected to establish liquid-phase UED operations at the facility. For more information please contact Alex Reid (alexhmr@slac.stanford.edu).
MeV-UED Run 5 Townhall
The LCLS MeV-UED Run 5 Townhall was held on April 2nd 2024. This webcast meeting was held to inform users about the developments at MeV-UED before the Run 5 proposal deadline on May 10th 2024. MeV-UED staff informed the community about the latest capabilities and answered Q&A. A recording of the meeting is available below:
Slides from the meeting are available at the following link: google drive folder with townhall slides.
MeV-UED Run 4 Data Analysis
MeV-UED staff scientist Yusong Liu led a data analysis tutorial workshop on October 23rd 2023 aimed at gas-phase photochemistry. Link to the workshop recording and materials.
LCLS MeV-UED Acknowledgement: Proposal teams must inform and acknowledge MeV-UED and the DOE Office of Science in presentations and publications using this template:
"MeV-UED is operated as part of the Linac Coherent Light Source at the SLAC National Accelerator Laboratory, supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Contract No. DE-AC02-76SF00515"
