Abstract
A two-electron wave packet among the lowest-lying doubly-excited states in helium is experimentally observed. It creates a 1-femtosecond modulation in the transient-absorption signal modified by a time-delayed coupling laser.
Highlights
Introduction and MotivationElectron wave packets are the quantum description of electrons in motion
A two-electron wave packet among the lowest-lying doubly-excited states in helium is experimentally observed. It creates a 1-femtosecond modulation in the transient-absorption signal modified by a time-delayed coupling laser
Wave packets formed by single electrons on attosecond time scales have recently been observed in helium [1,2]
Summary
Whenever more than one electronic state is coherently populated, a dynamical wave packet is formed. The characteristic time period of wave-packet evolution t corresponds to the inverse level spacing h/ E. Wave packets formed by single electrons on attosecond time scales have recently been observed in helium [1,2]. We measure a two-electron wave packet in helium via the coherent laser-induced coupling of low-lying autoionizing states [4]. Our experimental scheme combines attosecond transient-absorption spectroscopy [5] with optical detection at high spectral resolution (~20 meV @ 60 eV), which enables us to observe time-delay dependent changes on the spectrally narrow Fano absorption lines to evidence the two-electron wave packet
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