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Using Resonant Pulsed Rydberg Field-ionization (RPRFI) technique, we generatelow-energy electron bunches at high repetition rates. By combiningcontinuous-wave laser excitation with a pulsed electric field, this methodselectively ionizes Rydberg-Stark states in cesium atoms, producing sub-ns longelectron bunches (down to $\sim 250\:\textrm{ps}$) at a repetition rate of$\sim 10\:\textrm{MHz}$. The method is demonstrated to offer significantadvantages in terms of flexibility in the ionization repetition rate and pulsedelay adjustments. The RPRFI method holds promise for applications inhigh-resolution electron microscopy and spectroscopy, potentially forovercoming the limitations of traditional electron sources in terms ofbrightness and energy spread.

High repetition rate sub ns-electron pulses from Resonant Pulsed Rydberg Field Ionization