Time-of-flight electron energy loss spectroscopy by longitudinal phase space manipulation with microwave cavities

W. Verhoeven, J.F.M. van Rens, W.F. Toonen, E.R. Kieft, P.H.A. Mutsaers, O.J. Luiten

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The possibility to perform high-resolution time-resolved electron energy loss spectroscopy has the potential to impact a broad range of research fields. Resolving small energy losses with ultrashort electron pulses, however, is an enormous challenge due to the low average brightness of a pulsed beam. In this paper, we propose to use time-of-flight measurements combined with longitudinal phase space manipulation using resonant microwave cavities. This allows for both an accurate detection of energy losses with a high current throughput and efficient monochromation. First, a proof-of-principle experiment is presented, showing that with the incorporation of a compression cavity the flight time resolution can be improved significantly. Then, it is shown through simulations that by adding a cavity-based monochromation technique, a full-width-at-half-maximum energy resolution of 22 meV can be achieved with 3.1 ps pulses at a beam energy of 30 keV with currently available technology. By combining state-of-the-art energy resolutions with a pulsed electron beam, the technique proposed here opens up the way to detecting short-lived excitations within the regime of highly collective physics.

Original languageEnglish
Article number051101
Number of pages8
JournalStructural Dynamics
Issue number5
Publication statusPublished - 1 Sep 2018

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