What is it about?

Fano resonance is ubiquitous in nature, and the 2s2p resonance in helium atom is the most familiar one. By dressing a helium atom in an infrared laser field, its line shape can be modestly modified in standard XUV + IR experiments. Here, we show that dramatic change of the line shape (or Fano q-parameter) can occur within a few tens of attoseconds if an extremely shaped XUV pulse is used.

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Why is it important?

Our results suggest that strongly shaped attosecond XUV pulses offer the opportunity for controlling and probing fine features of narrow resonances on the few-ten attoseconds timescale


This work exemplifies extreme attosecond control of Fano resonance and electron dynamics. This work also indicates the significance of the temporal shape of attosecond XUV pulse, which has usually been ignored in most applications. Thus, it is desirable to identify its role under various scenarios of attosecond science.

Cheng Jin
Nanjing University of Science and Technology

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This page is a summary of: Controlling laser-dressed resonance line shape using attosecond extreme-ultraviolet pulse with a spectral minimum, Proceedings of the National Academy of Sciences, January 2024, Proceedings of the National Academy of Sciences,
DOI: 10.1073/pnas.2307836121.
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