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Title: Femtosecond time-resolved MeV electron diffraction

Abstract

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-TaS 2 are obtained utilizing a 5 fC (~3 × 10 4 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-TaS 2 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.

Authors:
 [1];  [2];  [2];  [2];  [3];  [4];  [4];  [4];  [2];  [2];  [2];  [2];  [5]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States); Shanghai Jiao Tong Univ., Shanghai (People's Republic of China)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. Florida State Univ., Tallahassee, FL (United States)
  4. IFW, Dresden (Germany)
  5. 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)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1307514
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
New Journal of Physics
Additional Journal Information:
Journal Volume: 17; Journal Issue: 6; Journal ID: ISSN 1367-2630
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; ultrafast electron diffraction; high-brightness electron beam; coherent length; ultrafast electron imaging

Citation Formats

Zhu, Pengfei, Zhu, Y., Hidaka, Y., Wu, L., Cao, J., Berger, H., Geck, J., Kraus, R., Pjerov, S., Shen, Y., Tobey, R. I., Hill, J. P., and Wang, X. J. Femtosecond time-resolved MeV electron diffraction. United States: N. p., 2015. Web. doi:10.1088/1367-2630/17/6/063004.
Zhu, Pengfei, Zhu, Y., Hidaka, Y., Wu, L., Cao, J., Berger, H., Geck, J., Kraus, R., Pjerov, S., Shen, Y., Tobey, R. I., Hill, J. P., & Wang, X. J. Femtosecond time-resolved MeV electron diffraction. United States. doi:10.1088/1367-2630/17/6/063004.
Zhu, Pengfei, Zhu, Y., Hidaka, Y., Wu, L., Cao, J., Berger, H., Geck, J., Kraus, R., Pjerov, S., Shen, Y., Tobey, R. I., Hill, J. P., and Wang, X. J. Tue . "Femtosecond time-resolved MeV electron diffraction". United States. doi:10.1088/1367-2630/17/6/063004. https://www.osti.gov/servlets/purl/1307514.
@article{osti_1307514,
title = {Femtosecond time-resolved MeV electron diffraction},
author = {Zhu, Pengfei and Zhu, Y. and Hidaka, Y. and Wu, L. and Cao, J. and Berger, H. and Geck, J. and Kraus, R. and Pjerov, S. and Shen, Y. and Tobey, R. I. and Hill, J. P. and Wang, X. J.},
abstractNote = {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.},
doi = {10.1088/1367-2630/17/6/063004},
journal = {New Journal of Physics},
number = 6,
volume = 17,
place = {United States},
year = {2015},
month = {6}
}

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