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We report on the observation of time-resolved quantum beats in the heliumfluorescence from the transition 1s3p -> 1s2s, where the initial state isexcited by XUV free-electron laser radiation. The quantum beats originate fromthe Zeeman splitting of the magnetic substates due to an external magneticfield. We perform a systematic study of this effect and discuss thepossibilities of studying this phenomenon in the XUV and x-ray regime.

Time-resolved quantum beats in the fluorescence of helium resonantly excited by XUV radiation