We establish the temporal analogue of transition radiation, when space boundary effects are ignored, and only temporal transitions are considered. We study the radiation spectrum emitted by a bunch of charged particles when they move in a medium where the refractive index abruptly changes in time. We apply it to the case of vacuum-plasma transitions due, for instance, to the sudden ionization of a neutral gas, and determine the spectral range of expected radiation. The case of Rydberg ultracold plasmas is also considered, where the spectral range of emitted radiation is considerably enhanced.
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J. T. Mendonça
Fundamental Plasma Physics
University of Lisbon
Instituto Politécnico de Lisboa
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J. T. Mendonça (Wed,) studied this question.
www.synapsesocial.com/papers/69eb0961553a5433e34b3e38 — DOI: https://doi.org/10.1016/j.fpp.2026.100118