Resonant RF Cavity Based Beam Chopping for Precise Control over Electron Arrival Time Distribution

Modulation (i.e., pulsing) of electron beams has been used in electron microscopy, mostly in a pumpprobe configuration, for achieving time resolution well beyond the typical framerates of cameras and other detectors [e.g., 1,2]. Meanwhile, there has been lively debate on the possible role of dose rate beside total dose as a factor governing reversible as well as irreversible loss of contrast in sensitive samples under investigation in high-resolution (S)TEM By extension, also the arrival time distribution of electrons in the beam may have a similar influence, leading to possible new application of time-modulated beams in the study of dose sensitive specimens