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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...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Crystallographic Association
2017
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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. |
format | Online Article Text |
id | pubmed-5422208 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | American Crystallographic Association |
record_format | MEDLINE/PubMed |
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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