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Updated: Aug 5, 2026
08:12
An Introduction to Processing, Fitting, and Interpreting Transient Absorption Data
Published on: February 16, 2024
Table-top all-attosecond transient absorption spectroscopy
Mikhail Volkov1, Evaldas Svirplys1, Stefanos Carlström1
1Max-Born-Institut, Berlin, Germany.
Nature Communications
|July 28, 2026
Summary
All-attosecond transient absorption spectroscopy (AATAS) now achieves attosecond resolution using high-harmonic generation sources. This breakthrough reveals ultrafast electronic coherences and valence hole motion in noble gases.
Area of Science:
- Attosecond science
- Ultrafast spectroscopy
- Quantum dynamics
Background:
- Attosecond transient absorption spectroscopy (ATAS) combines high temporal and spectral resolution.
- Current ATAS methods rely on femtosecond near-infrared pulses, limiting true attosecond resolution.
- Investigating ultrafast electron dynamics requires enhanced spectroscopic capabilities.
Purpose of the Study:
- To demonstrate time-resolved all-attosecond transient absorption spectroscopy (AATAS).
- To utilize a table-top high-harmonic generation (HHG) source for AATAS.
- To investigate electronic coherences and ultrafast dynamics in noble gases.
Main Methods:
- Implementation of AATAS using a table-top high-harmonic generation (HHG) source.
- Utilizing HHG's broad bandwidth, high stability, and accessibility for attosecond pump-probe experiments.
- Application to noble gas atoms (Xe, Kr, Ar, Ne) for studying electron dynamics.
Main Results:
- Successful demonstration of time-resolved AATAS.
- Observation of previously unresolved electronic coherences in Xenon.
- Revealed oscillatory valence hole motion in Xenon with a 3-femtosecond period.
- Presented systematic investigations of electron dynamics in Krypton, Argon, and Neon.
Conclusions:
- HHG sources are ideal for AATAS due to their characteristics.
- AATAS opens new possibilities for studying ultrafast electron dynamics.
- The developed method is accessible for replication in various laboratories.
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