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000476364 1001_ $$0P:(DE-H253)PIP1029312$$aAufleger, Lennart$$b0$$eCorresponding author
000476364 245__ $$aLine-shape broadening of an autoionizing state in helium at high XUV intensity
000476364 260__ $$a[London]$$bIOP$$c2022
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000476364 520__ $$aWe study the interaction of intense extreme ultraviolet (XUV) light with the 2s2p doubly excitedstate in helium. In addition to previously understood energy-level and phase shifts, high XUVintensities may lead to other absorption-line-shape distortions. Here, we report on experimentaltransient-absorption spectroscopy results on the 2s2p line-width modification in helium in intensestochastic XUV fields. A few-level-model simulation is realized to investigate the origins of thiseffect. We find that the line-shape broadening is connected to the strong coupling of the groundstate to the 2s2p doubly excited state which is embedded in the ionization continuum. As thebroadening takes place for intensities lower than for other strong-coupling processes, e.g. observedasymmetry changes of the absorption profile, this signature can be identified already in anintermediate intensity regime. These findings are in general relevant for resonant inner-shelltransitions in nonlinear experiments with XUV and x-ray photon energies at high intensity.
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000476364 7001_ $$0P:(DE-H253)PIP1086543$$aFriebel, Patrick$$b1
000476364 7001_ $$0P:(DE-H253)PIP1081991$$aRupprecht, Patrick$$b2
000476364 7001_ $$0P:(DE-H253)PIP1029644$$aMagunia, Alexander$$b3
000476364 7001_ $$0P:(DE-H253)PIP1025177$$aDing, Thomas$$b4
000476364 7001_ $$0P:(DE-H253)PIP1029310$$aRebholz, Marc$$b5
000476364 7001_ $$0P:(DE-H253)PIP1029309$$aHartmann, Maximilian$$b6
000476364 7001_ $$0P:(DE-H253)PIP1018108$$aOtt, Christian$$b7$$eCorresponding author
000476364 7001_ $$0P:(DE-H253)PIP1010834$$aPfeifer, Thomas$$b8$$eCorresponding author
000476364 773__ $$0PERI:(DE-600)1464444-7$$a10.1088/1367-2630/ac3b2e$$gVol. 24, no. 1, p. 013014 -$$n1$$p013014 -$$tNew journal of physics$$v24$$x1367-2630$$y2022
000476364 8564_ $$uhttps://doi.org/10.1088/1367-2630/ac3b2e
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