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Title: Femtosecond MeV Electron Energy-Loss Spectroscopy

Pump-probe electron energy-loss spectroscopy (EELS) with femtosecond temporal resolution will be a transformative research tool for studying nonequilibrium chemistry and electronic dynamics of matter. Here in this article, we propose a concept of femtosecond EELS utilizing mega-electron-volt electron beams from a radio-frequency (rf) photocathode source. The high acceleration gradient and high beam energy of the rf gun are critical to the generation of 10-fs electron beams, which enables an improvement of the temporal resolution by more than 1 order of magnitude beyond the state of the art. In our proposal, the “referencebeam technique” relaxes the energy stability requirement of the rf power source by roughly 2 orders of magnitude. The requirements for the electron-beam quality, photocathode, spectrometer, and detector are also discussed. Supported by particle-tracking simulations, we demonstrate the feasibility of achieving subelectron- volt energy resolution and approximately 10-fs temporal resolution with existing or near-future hardware performance.
Authors:
 [1] ;  [1]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Grant/Contract Number:
AC02-76SF00515; 2016YFA0202500; AC02-05CH11231
Type:
Accepted Manuscript
Journal Name:
Physical Review Applied
Additional Journal Information:
Journal Volume: 8; Journal Issue: 5; Journal ID: ISSN 2331-7019
Publisher:
American Physical Society (APS)
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS
OSTI Identifier:
1410519
Alternate Identifier(s):
OSTI ID: 1408163; OSTI ID: 1418213

Li, R. K., and Wang, X. J.. Femtosecond MeV Electron Energy-Loss Spectroscopy. United States: N. p., Web. doi:10.1103/PhysRevApplied.8.054017.
Li, R. K., & Wang, X. J.. Femtosecond MeV Electron Energy-Loss Spectroscopy. United States. doi:10.1103/PhysRevApplied.8.054017.
Li, R. K., and Wang, X. J.. 2017. "Femtosecond MeV Electron Energy-Loss Spectroscopy". United States. doi:10.1103/PhysRevApplied.8.054017. https://www.osti.gov/servlets/purl/1410519.
@article{osti_1410519,
title = {Femtosecond MeV Electron Energy-Loss Spectroscopy},
author = {Li, R. K. and Wang, X. J.},
abstractNote = {Pump-probe electron energy-loss spectroscopy (EELS) with femtosecond temporal resolution will be a transformative research tool for studying nonequilibrium chemistry and electronic dynamics of matter. Here in this article, we propose a concept of femtosecond EELS utilizing mega-electron-volt electron beams from a radio-frequency (rf) photocathode source. The high acceleration gradient and high beam energy of the rf gun are critical to the generation of 10-fs electron beams, which enables an improvement of the temporal resolution by more than 1 order of magnitude beyond the state of the art. In our proposal, the “referencebeam technique” relaxes the energy stability requirement of the rf power source by roughly 2 orders of magnitude. The requirements for the electron-beam quality, photocathode, spectrometer, and detector are also discussed. Supported by particle-tracking simulations, we demonstrate the feasibility of achieving subelectron- volt energy resolution and approximately 10-fs temporal resolution with existing or near-future hardware performance.},
doi = {10.1103/PhysRevApplied.8.054017},
journal = {Physical Review Applied},
number = 5,
volume = 8,
place = {United States},
year = {2017},
month = {11}
}