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Extreme-ultraviolet high-harmonic generation in liquids
Tran Trung Luu1, Zhong Yin2, Arohi Jain2
1Laboratorium für Physikalische Chemie, ETH Zürich, 8093, Zürich, Switzerland. trung.luu@phys.chem.ethz.ch.
Nature Communications
|September 15, 2018
Summary
Researchers achieved extreme ultraviolet high-harmonic generation (HHG) from liquids like water and alcohols. This breakthrough enables liquid-phase high-harmonic spectroscopy for studying electronic structures.
Area of Science:
- Attosecond science
- Quantum optics
- Condensed matter physics
Background:
- High-harmonic generation (HHG) in gases is crucial for attosecond science.
- Recent advances include HHG from solids, but liquid HHG remains limited.
- Previous liquid HHG studies were restricted to low-energy visible harmonics.
Purpose of the Study:
- To demonstrate and characterize extreme ultraviolet (XUV) HHG from liquids.
- To explore the potential of liquid-phase HHG for spectroscopy.
- To investigate the electronic structure of liquids using HHG.
Main Methods:
- Implementation of liquid flat-microjet technology.
- Spatial separation of HHG from bulk liquid and surrounding gas.
- Detailed spectral characterization of generated harmonics.
Main Results:
- Observed XUV HHG from liquid water and alcohols beyond 20 eV.
- Demonstrated spatial separation of HHG using the microjet.
- Identified significant spectral differences between water and alcohols.
- HHG spectra showed sensitivity to the electronic structure of liquids.
Conclusions:
- Liquid-phase high-harmonic spectroscopy is a new potential method.
- This technique can probe electronic structure and ultrafast dynamics in liquids.
- HHG from liquids opens new avenues in attosecond science.
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