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Abstract

Fano Resonances in the Time Domain - understanding and controlling the absorption and emission of light—Within this work, starting from the well known theory for photoabsorption cross sections by Ugo Fano, a new formalism is developed, which enables measurement and control of phase and amplitude changes in an emitting dipole. This is shown by experimental measurements in singly and doubly excited helium that confirm the formalism. An application in time-domain quantum holography of excited states, allowing to separate laser-induced coupling pathways, is also presented.