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Dressing effects in the attosecond transient absorption spectra of doubly excited states in helium

Strong-field manipulation of autoionizing states is a crucial aspect of electronic quantum control. Recent measurements of the attosecond transient absorption spectrum (ATAS) of helium dressed by a few-cycle visible pulse [C. Ott et al., Nature (London) 516, 374 (2014)] provide evidence of the inver...

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Bibliographic Details
Main Authors: Argenti, L. (Author) , Jiménez-Galán, Á. (Author) , Marante, C. (Author) , Ott, Christian (Author) , Pfeifer, Thomas (Author) , Martín, F. (Author)
Format: Article (Journal)
Language:English
Published: 11 June 2015
In: Physical review. A, Atomic, molecular, and optical physics
Year: 2015, Volume: 91, Issue: 6
ISSN:1094-1622
DOI:10.1103/PhysRevA.91.061403
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevA.91.061403
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevA.91.061403
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Author Notes:L. Argenti, Á. Jiménez-Galán, C. Marante, C. Ott, T. Pfeifer, and F. Martín
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Summary:Strong-field manipulation of autoionizing states is a crucial aspect of electronic quantum control. Recent measurements of the attosecond transient absorption spectrum (ATAS) of helium dressed by a few-cycle visible pulse [C. Ott et al., Nature (London) 516, 374 (2014)] provide evidence of the inversion of Fano profiles. With the support of accurate ab initio calculations that reproduce the results of the latter experiment, here we investigate the new physics that arise from ATAS when the laser intensity is increased. In particular, we show that (i) previously unnoticed signatures of the dark 2p21S doubly excited state are observed in the experimental spectrum, (ii) inversion of Fano profiles is predicted to be periodic in the laser intensity, and (iii) the ac Stark shift of the higher terms in the sp+2,n autoionizing series exceeds the ponderomotive energy, which is the result of a genuine two-electron contribution to the polarization of the excited atom.
Item Description:Gesehen am 27.07.2020
Physical Description:Online Resource
ISSN:1094-1622
DOI:10.1103/PhysRevA.91.061403

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