{"title":"Front Cover: Influence of Photoemission Geometry on Timing and Efficiency in 4D Ultrafast Electron Microscopy (ChemPhysChem 5/2025)","authors":"Simon A. Willis, David J. Flannigan","doi":"10.1002/cphc.202580501","DOIUrl":null,"url":null,"abstract":"<p><b>The Front Cover</b> shows unconventional photoelectron emission with a train of ultraviolet femtosecond laser pulses in the electron gun of an ultrafast electron microscope. Off-axis photoemission from the aperture surface of the electron gun leads to surprising behavior of the photoelectron collection efficiency and of the statistical temporal spread of the ultrashort electron packets. More information can be found in the Research Article by S. A. Willis and D. J. Flannigan (DOI: 10.1002/cphc.202401032). Illustration by Rick Simonson, Science Lab Studios, Inc.\n <figure>\n <div><picture>\n <source></source></picture><p></p>\n </div>\n </figure>\n </p>","PeriodicalId":9819,"journal":{"name":"Chemphyschem","volume":"26 5","pages":""},"PeriodicalIF":2.3000,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/cphc.202580501","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Chemphyschem","FirstCategoryId":"92","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/cphc.202580501","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
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Abstract
The Front Cover shows unconventional photoelectron emission with a train of ultraviolet femtosecond laser pulses in the electron gun of an ultrafast electron microscope. Off-axis photoemission from the aperture surface of the electron gun leads to surprising behavior of the photoelectron collection efficiency and of the statistical temporal spread of the ultrashort electron packets. More information can be found in the Research Article by S. A. Willis and D. J. Flannigan (DOI: 10.1002/cphc.202401032). Illustration by Rick Simonson, Science Lab Studios, Inc.
期刊介绍：
ChemPhysChem is one of the leading chemistry/physics interdisciplinary journals (ISI Impact Factor 2018: 3.077) for physical chemistry and chemical physics. It is published on behalf of Chemistry Europe, an association of 16 European chemical societies.
ChemPhysChem is an international source for important primary and critical secondary information across the whole field of physical chemistry and chemical physics. It integrates this wide and flourishing field ranging from Solid State and Soft-Matter Research, Electro- and Photochemistry, Femtochemistry and Nanotechnology, Complex Systems, Single-Molecule Research, Clusters and Colloids, Catalysis and Surface Science, Biophysics and Physical Biochemistry, Atmospheric and Environmental Chemistry, and many more topics. ChemPhysChem is peer-reviewed.
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