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Femtosecond Electronic and Hydrogen Structural Dynamics in Ammonia Imaged with Ultrafast Electron Diffraction

Champenois, Elio G. (author)
Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
H. List, Nanna (author)
KTH,Tillämpad fysikalisk kemi
Ware, Matthew (author)
Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
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Britton, Mathew (author)
Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA; Department of Physics, Stanford University, Stanford, California 94305, USA
Bucksbaum, Philip H. (author)
Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA; Department of Physics, Stanford University, Stanford, California 94305, USA
Cheng, Xinxin (author)
SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
Centurion, Martin (author)
Department of Physics and Astronomy, University of Nebraska Lincoln, Lincoln, Nebraska 68588, USA
Cryan, James P. (author)
Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
Forbes, Ruaridh (author)
SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
Gabalski, Ian (author)
Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA; Department of Applied Physics, Stanford University, Stanford, California 94305, USA
Hegazy, Kareem (author)
Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA; Department of Physics, Stanford University, Stanford, California 94305, USA
Hoffmann, Matthias C. (author)
SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
Howard, Andrew J. (author)
Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA; Department of Applied Physics, Stanford University, Stanford, California 94305, USA
Ji, Fuhao (author)
SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
Lin, Ming Fu (author)
SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
Nunes, J. Pedro F. (author)
Department of Physics and Astronomy, University of Nebraska Lincoln, Lincoln, Nebraska 68588, USA
Shen, Xiaozhe (author)
SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
Yang, Jie (author)
SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA; Department of Chemistry, Tsinghua University, Beijing 100084, China
Wang, Xijie (author)
SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
Martinez, Todd J. (author)
Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA; Department of Chemistry, Stanford University, Stanford, California 94305, USA
Wolf, Thomas J.A. (author)
Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
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 (creator_code:org_t)
American Physical Society (APS), 2023
2023
English.
In: Physical Review Letters. - : American Physical Society (APS). - 0031-9007 .- 1079-7114. ; 131:14
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • Directly imaging structural dynamics involving hydrogen atoms by ultrafast diffraction methods is complicated by their low scattering cross sections. Here we demonstrate that megaelectronvolt ultrafast electron diffraction is sufficiently sensitive to follow hydrogen dynamics in isolated molecules. In a study of the photodissociation of gas phase ammonia, we simultaneously observe signatures of the nuclear and corresponding electronic structure changes resulting from the dissociation dynamics in the time-dependent diffraction. Both assignments are confirmed by ab initio simulations of the photochemical dynamics and the resulting diffraction observable. While the temporal resolution of the experiment is insufficient to resolve the dissociation in time, our results represent an important step towards the observation of proton dynamics in real space and time.

Subject headings

NATURVETENSKAP  -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)

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