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High current table-top setup for femtosecond gas electron diffraction

We have constructed an experimental setup for gas phase electron diffraction with femtosecond resolution and a high average beam current. While gas electron diffraction has been successful at determining molecular structures, it has been a challenge to reach femtosecond resolution while maintaining...

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Detalles Bibliográficos
Autores principales: Zandi, Omid, Wilkin, Kyle J., Xiong, Yanwei, Centurion, Martin
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Crystallographic Association 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5422208/
https://www.ncbi.nlm.nih.gov/pubmed/28529963
http://dx.doi.org/10.1063/1.4983225
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author Zandi, Omid
Wilkin, Kyle J.
Xiong, Yanwei
Centurion, Martin
author_facet Zandi, Omid
Wilkin, Kyle J.
Xiong, Yanwei
Centurion, Martin
author_sort Zandi, Omid
collection PubMed
description We have constructed an experimental setup for gas phase electron diffraction with femtosecond resolution and a high average beam current. While gas electron diffraction has been successful at determining molecular structures, it has been a challenge to reach femtosecond resolution while maintaining sufficient beam current to retrieve structures with high spatial resolution. The main challenges are the Coulomb force that leads to broadening of the electron pulses and the temporal blurring that results from the velocity mismatch between the laser and electron pulses as they traverse the sample. We present here a device that uses pulse compression to overcome the Coulomb broadening and deliver femtosecond electron pulses on a gas target. The velocity mismatch can be compensated using laser pulses with a tilted intensity front to excite the sample. The temporal resolution of the setup was determined with a streak camera to be better than 400 fs for pulses with up to half a million electrons and a kinetic energy of 90 keV. The high charge per pulse, combined with a repetition rate of 5 kHz, results in an average beam current that is between one and two orders of magnitude higher than previously demonstrated.
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spelling pubmed-54222082017-05-19 High current table-top setup for femtosecond gas electron diffraction Zandi, Omid Wilkin, Kyle J. Xiong, Yanwei Centurion, Martin Struct Dyn Ultrafast Structural Dynamics—A Tribute to Ahmed H. Zewail We have constructed an experimental setup for gas phase electron diffraction with femtosecond resolution and a high average beam current. While gas electron diffraction has been successful at determining molecular structures, it has been a challenge to reach femtosecond resolution while maintaining sufficient beam current to retrieve structures with high spatial resolution. The main challenges are the Coulomb force that leads to broadening of the electron pulses and the temporal blurring that results from the velocity mismatch between the laser and electron pulses as they traverse the sample. We present here a device that uses pulse compression to overcome the Coulomb broadening and deliver femtosecond electron pulses on a gas target. The velocity mismatch can be compensated using laser pulses with a tilted intensity front to excite the sample. The temporal resolution of the setup was determined with a streak camera to be better than 400 fs for pulses with up to half a million electrons and a kinetic energy of 90 keV. The high charge per pulse, combined with a repetition rate of 5 kHz, results in an average beam current that is between one and two orders of magnitude higher than previously demonstrated. American Crystallographic Association 2017-05-08 /pmc/articles/PMC5422208/ /pubmed/28529963 http://dx.doi.org/10.1063/1.4983225 Text en © 2017 Author(s). 2329-7778/2017/4(4)/044022/10 All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Ultrafast Structural Dynamics—A Tribute to Ahmed H. Zewail
Zandi, Omid
Wilkin, Kyle J.
Xiong, Yanwei
Centurion, Martin
High current table-top setup for femtosecond gas electron diffraction
title High current table-top setup for femtosecond gas electron diffraction
title_full High current table-top setup for femtosecond gas electron diffraction
title_fullStr High current table-top setup for femtosecond gas electron diffraction
title_full_unstemmed High current table-top setup for femtosecond gas electron diffraction
title_short High current table-top setup for femtosecond gas electron diffraction
title_sort high current table-top setup for femtosecond gas electron diffraction
topic Ultrafast Structural Dynamics—A Tribute to Ahmed H. Zewail
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5422208/
https://www.ncbi.nlm.nih.gov/pubmed/28529963
http://dx.doi.org/10.1063/1.4983225
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