%0 Generic
%A Hu, Shuyuan
%C Heidelberg
%D 2024
%F heidok:34448
%R 10.11588/heidok.00034448
%T Attosecond dynamics of dipole-coupled doubly excited states in helium
%U https://archiv.ub.uni-heidelberg.de/volltextserver/34448/
%X Within this work, electron dynamics in atoms are experimentally and numerically investigated on their natural attosecond time scales. To access these dynamics, ultrashort and moderately intense few-cycle laser pulses are superposed with attosecond pulsed radiation in the extreme-ultraviolet spectral region In particular, a bound two-electron wave packet in helium on attosecond time scales was experimentally observed. A novel experiment is presented to simultaneously measure resonant photoabsorption spectra of laser-coupled doubly excited states in helium and the streaked photoelectron spectra. It provides the advantage of obtaining an absolute calibration of the time-delay zero for absorption spectra, where delay-dependent phase information is extracted.