Femtosecond time-resolved MeV electron diffraction
- Brookhaven National Lab. (BNL), Upton, NY (United States); Shanghai Jiao Tong Univ., Shanghai (People's Republic of China)
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Florida State Univ., Tallahassee, FL (United States)
- IFW, Dresden (Germany)
- Brookhaven National Lab. (BNL), Upton, NY (United States); Shanghai Jiao Tong Univ., Shanghai (People's Republic of China); SLAC National Accelerator Lab., Menlo Park, CA (United States)
We report the experimental demonstration of femtosecond electron diffraction using high-brightness MeV electron beams. High-quality, single-shot electron diffraction patterns for both polycrystalline aluminum and single-crystal 1T-TaS2 are obtained utilizing a 5 fC (~3 × 104 electrons) pulse of electrons at 2.8 MeV. The high quality of the electron diffraction patterns confirms that electron beam has a normalized emittance of ~50 nm rad. The transverse and longitudinal coherence length is ~11 and ~2.5 nm, respectively. The timing jitter between the pump laser and probe electron beam was found to be ~100 fs (rms). The temporal resolution is demonstrated by observing the evolution of Bragg and superlattice peaks of 1T-TaS2 following an 800 nm optical pump and was found to be 130 fs. Lastly, our results demonstrate the advantages of MeV electrons, including large elastic differential scattering cross-section and access to high-order reflections, and the feasibility of ultimately realizing below 10 fs time-resolved electron diffraction.
- Research Organization:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC02-76SF00515
- OSTI ID:
- 1307514
- Journal Information:
- New Journal of Physics, Vol. 17, Issue 6; ISSN 1367-2630
- Publisher:
- IOP PublishingCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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