Time-resolved quantum beats in the fluorescence of helium resonantly excited by XUV radiation
physics.atom-ph
/ Authors
AC LaForge, A Benediktovitch, V Sukharnikov, Š Krušič, M Žitnik, M Debatin, RW Falcone, JD Asmussen, M Mudrich, R Michiels
and 11 more authors
F Stienkemeier, L Badano, C Callegari, M Di Fraia, M Ferianis, L Giannessi, O Plekan, KC Prince, C Spezzani, N Rohringer, N Berrah
/ Abstract
We report on the observation of time-resolved quantum beats in the helium fluorescence from the transition 1s3p -> 1s2s, where the initial state is excited by XUV free-electron laser radiation. The quantum beats originate from the Zeeman splitting of the magnetic substates due to an external magnetic field. We perform a systematic study of this effect and discuss the possibilities of studying this phenomenon in the XUV and x-ray regime.