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4D multiple-cathode ultrafast electron microscopy

Baskin, John Spencer and Liu, Haihua and Zewail, Ahmed H. (2014) 4D multiple-cathode ultrafast electron microscopy. Proceedings of the National Academy of Sciences of the United States of America, 111 (29). pp. 10479-10484. ISSN 0027-8424. PMCID PMC4115550. doi:10.1073/pnas.1411650111.

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Four-dimensional multiple-cathode ultrafast electron microscopy is developed to enable the capture of multiple images at ultrashort time intervals for a single microscopic dynamic process. The dynamic process is initiated in the specimen by one femtosecond light pulse and probed by multiple packets of electrons generated by one UV laser pulse impinging on multiple, spatially distinct, cathode surfaces. Each packet is distinctly recorded, with timing and detector location controlled by the cathode configuration. In the first demonstration, two packets of electrons on each image frame (of the CCD) probe different times, separated by 19 picoseconds, in the evolution of the diffraction of a gold film following femtosecond heating. Future elaborations of this concept to extend its capabilities and expand the range of applications of 4D ultrafast electron microscopy are discussed. The proof-of-principle demonstration reported here provides a path toward the imaging of irreversible ultrafast phenomena of materials, and opens the door to studies involving the single-frame capture of ultrafast dynamics using single-pump/multiple-probe, embedded stroboscopic imaging.

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Additional Information:© 2014 National Academy of Sciences. Freely available online through the PNAS open access option. Contributed by Ahmed H. Zewail, June 20, 2014 (sent for review June 6, 2014). Published ahead of print July 8, 2014. We thank Erik Kieft and Robert Murphy of FEI for their assistance in the modification of microscope control electronics. This work was supported by the National Science Foundation (DMR-0964886) and the Air Force Office of Scientific Research (FA9550-11-1-0055) in the Gordon and Betty Moore Center for Physical Biology at the California Institute of Technology. Author contributions: J.S.B., H.L., and A.H.Z. designed research, performed research, and wrote the paper. The authors declare no conflict of interest.
Funding AgencyGrant Number
Air Force Office of Scientific Research (AFOSR)FA9550-11-1-0055
Gordon and Betty Moore FoundationUNSPECIFIED
Subject Keywords:electron pulse generation; ultrafast imaging; irreversible dynamics
Issue or Number:29
PubMed Central ID:PMC4115550
Record Number:CaltechAUTHORS:20140709-100420918
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Official Citation:John Spencer Baskin, Haihua Liu, and Ahmed H. Zewail 4D multiple-cathode ultrafast electron microscopy PNAS 2014 111 (29) 10479-10484; published ahead of print July 8, 2014, doi:10.1073/pnas.1411650111
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:47100
Deposited By: Tony Diaz
Deposited On:09 Jul 2014 17:13
Last Modified:10 Nov 2021 17:34

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