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Interference patterns in ionization of Kramers-Henneberger atom
I A Ivanov1,2, A S Kheifets3, Kyung Taec Kim4
1Center for Relativistic Laser Science, Institute for Basic Science, Gwangju, 61005, Republic of Korea. igorivanov@ibs.re.kr.
Scientific Reports
|October 11, 2022
Summary
We visualized the potassium atom's Kramers-Henneberger (KH) state using laser pulses. Ionization revealed molecular-like features, aiding spatial dimension estimation and laser calibration.
Area of Science:
- Atomic Physics
- Quantum Mechanics
- Laser Spectroscopy
Background:
- The Kramers-Henneberger (KH) state describes an atom in a strong laser field.
- Understanding electron behavior in such states is crucial for quantum optics and materials science.
Purpose of the Study:
- To visualize the KH state of a potassium atom.
- To investigate molecular-like features in atomic ionization.
- To assess the analogy between KH atoms and diatomic molecules.
Main Methods:
- Utilizing combined infrared (IR) pump and extreme ultraviolet (XUV) probe laser pulses.
- Analyzing photoelectron momentum spectra to observe interference patterns.
Main Results:
- Observed low-order interference maxima in photoelectron spectra, similar to molecular ionization.
- Used these maxima to estimate the spatial dimensions of the KH atom.
- Demonstrated limitations to the molecular analogy due to the KH potential structure.
Conclusions:
- The KH atom exhibits unique ionization dynamics with molecular-like characteristics.
- The observed features allow for precise laser field calibration.
- The KH potential's structure differs significantly from molecular potentials, limiting the analogy.
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