Watching the emergence of a Fano resonance in doubly excited helium

30th International Conference on Photonic, Electronic, and Atomic Collisions

Blättermann, Alexander^1 ; Kaldun, Andreas^1 ; Stooß, Veit^1 ; Donsa, Stefan^2 ; Wei, Hui^3 ; Pazourek, Renate^2 ; Nagele, Stefan^2 ; Ott, Christian^1 ; Lin, Chii-Dong^3 ; Burgdörfer, Joachim^2 ; Pfeifer, Thomas^1

Max Planck Institute for Nuclear Physics, EU, Heidelberg

69118, Germany^1

Institute for Theoretical Physics, Vienna University of Technology, EU, Vienna

1040, Austria^2

Department of Physics, Kansas State University, Manhattan

KS

66506, United States^3

关键词: Ab initio simulations;    Absorption lines;    Fano resonances;    Natural decay;    Strong field ionization;    Temporally resolved;    Theoretical investigations;    Variable time delay;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/875/2/012010/pdf
DOI  :  10.1088/1742-6596/875/2/012010

来源: IOP

【 摘 要 】

We report on the experimental observation of the buildup of the 2s2p Fano resonance in helium in the time domain, which has been under theoretical investigation for more than a decade. The emergence of the absorption line is temporally resolved by interrupting the natural decay of the excited state via saturated strong-field ionization at a variable time delay. We compare the experimental data with full ab-initio simulations to validate the time-gating by strong-field ionization and thereby confirm the recently developed theory for the formation of Fano line-profiles.