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Title: Femtosecond gas-phase mega-electron-volt ultrafast electron diffraction

Abstract

The development of ultrafast gas electron diffraction with non-relativistic electrons has enabled determination of molecular structures with atomic spatial resolution. It has, however, been challenging to break the picosecond temporal resolution barrier and achieve the goal that has long been envisioned – making space- and-time resolved molecular movies of chemical reaction in the gas-phase. Recently, an ultrafast electron diffraction (UED) apparatus using mega-electron-volt (MeV) electrons was developed at SLAC National Accelerator Laboratory for imaging ultrafast structural dynamics of molecules in the gas phase. The SLAC gas-phase MeV UED has achieved 70 fs root-mean-square temporal resolution, 0.63 Å spatial resolution, and 0.22 Å –1 reciprocal-space resolution. Such high spatial-temporal resolution has enabled the capturing of real-time molecular movies of fundamental photochemical mechanisms, such as chemical bond breaking, ring opening, and a nuclear wave packet crossing a conical intersection. In this paper, the design that enables the high spatial-temporal resolution of the SLAC gas phase MeV UED is presented. The compact design of the differential pump section of the SLAC gas phase MeV UED realized five orders-of-magnitude vacuum isolation between the electron source and gas sample chamber. The spatial resolution, temporal resolution and long-term stability of the apparatus are systematically characterized.

Authors:
 [1]; ORCiD logo [2];  [1];  [1];  [3];  [1];  [2]; ORCiD logo [4];  [1]; ORCiD logo [1];  [1];  [4];  [2];  [1]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  2. Univ. of Nebraska, Lincoln, NE (United States)
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States); Tsinghua Univ., Beijing (China)
  4. Universität Potsdam (Germany)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Chemical Sciences, Geosciences & Biosciences Division; USDOE
OSTI Identifier:
1572204
Alternate Identifier(s):
OSTI ID: 1570490
Report Number(s):
DOE-SLAC-00515; DOE-Nebraska-Lincoln-14170
Journal ID: ISSN 2329-7778
Grant/Contract Number:  
AC02-76SF00515; SC0014170
Resource Type:
Accepted Manuscript
Journal Name:
Structural Dynamics
Additional Journal Information:
Journal Volume: 6; Journal Issue: 5; Conference: 4. Femtosecond Electron Imaging and Spectroscopy (FEIS 4), Lincoln, NE (United States), 13-15 May 2019; Journal ID: ISSN 2329-7778
Publisher:
American Crystallographic Association/AIP
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS

Citation Formats

Shen, X., Nunes, J. P. F., Yang, J., Jobe, R. K., Li, R. K., Lin, Ming-Fu, Moore, B., Niebuhr, M., Weathersby, S. P., Wolf, T. J. A., Yoneda, C., Guehr, Markus, Centurion, Martin, and Wang, X. J. Femtosecond gas-phase mega-electron-volt ultrafast electron diffraction. United States: N. p., 2019. Web. doi:10.1063/1.5120864.
Shen, X., Nunes, J. P. F., Yang, J., Jobe, R. K., Li, R. K., Lin, Ming-Fu, Moore, B., Niebuhr, M., Weathersby, S. P., Wolf, T. J. A., Yoneda, C., Guehr, Markus, Centurion, Martin, & Wang, X. J. Femtosecond gas-phase mega-electron-volt ultrafast electron diffraction. United States. doi:10.1063/1.5120864.
Shen, X., Nunes, J. P. F., Yang, J., Jobe, R. K., Li, R. K., Lin, Ming-Fu, Moore, B., Niebuhr, M., Weathersby, S. P., Wolf, T. J. A., Yoneda, C., Guehr, Markus, Centurion, Martin, and Wang, X. J. Tue . "Femtosecond gas-phase mega-electron-volt ultrafast electron diffraction". United States. doi:10.1063/1.5120864. https://www.osti.gov/servlets/purl/1572204.
@article{osti_1572204,
title = {Femtosecond gas-phase mega-electron-volt ultrafast electron diffraction},
author = {Shen, X. and Nunes, J. P. F. and Yang, J. and Jobe, R. K. and Li, R. K. and Lin, Ming-Fu and Moore, B. and Niebuhr, M. and Weathersby, S. P. and Wolf, T. J. A. and Yoneda, C. and Guehr, Markus and Centurion, Martin and Wang, X. J.},
abstractNote = {The development of ultrafast gas electron diffraction with non-relativistic electrons has enabled determination of molecular structures with atomic spatial resolution. It has, however, been challenging to break the picosecond temporal resolution barrier and achieve the goal that has long been envisioned – making space- and-time resolved molecular movies of chemical reaction in the gas-phase. Recently, an ultrafast electron diffraction (UED) apparatus using mega-electron-volt (MeV) electrons was developed at SLAC National Accelerator Laboratory for imaging ultrafast structural dynamics of molecules in the gas phase. The SLAC gas-phase MeV UED has achieved 70 fs root-mean-square temporal resolution, 0.63 Å spatial resolution, and 0.22 Å–1 reciprocal-space resolution. Such high spatial-temporal resolution has enabled the capturing of real-time molecular movies of fundamental photochemical mechanisms, such as chemical bond breaking, ring opening, and a nuclear wave packet crossing a conical intersection. In this paper, the design that enables the high spatial-temporal resolution of the SLAC gas phase MeV UED is presented. The compact design of the differential pump section of the SLAC gas phase MeV UED realized five orders-of-magnitude vacuum isolation between the electron source and gas sample chamber. The spatial resolution, temporal resolution and long-term stability of the apparatus are systematically characterized.},
doi = {10.1063/1.5120864},
journal = {Structural Dynamics},
number = 5,
volume = 6,
place = {United States},
year = {2019},
month = {10}
}

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