Experimental study demonstrates temporal dynamics of ultraviolet superfluorescence in helium ions, revealing key differences between direct and cascade decay pathways.
We report the results of an experiment to study the temporal properties of superfluorescence at a wavelength of 164 nm emitted from helium ions excited to either the 3p state or 4p state by pulses from a free-electron laser. The two different processes (direct 3p–2s superfluorescence; two-step cascade 4p–3s–2p or 4p–3d–2p superfluorescence) are compared to each other and to the results of numerical simulations.
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Harries et al. (2026) studied this question.
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