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Measuring the photoelectron emission delay in the molecular frame
Jonas Rist1, Kim Klyssek2, Nikolay M Novikovskiy3,4
1Institut für Kernphysik, J. W. Goethe-Universität, Max-von-Laue-Str. 1, 60438, Frankfurt, Germany. rist@atom.uni-frankfurt.de.
Nature Communications
|November 18, 2021
Summary
Scientists measured electron emission delays without needing attosecond pulses. This new method uses photoelectron diffraction by the parent ion to map emission times in molecules.
Area of Science:
- Atomic and Molecular Physics
- Quantum Mechanics
- Ultrafast Science
Background:
- Measuring electron emission times from atoms is crucial but challenging due to the attosecond timescale.
- Attosecond metrology with intense lasers has driven experimental interest in electron emission delays.
Purpose of the Study:
- To develop a novel method for measuring electron emission delays without attosecond light pulses or superimposed infrared fields.
- To investigate the dependence of emission delays on photoelectron energy and direction within a molecule.
Main Methods:
- Utilizing photoelectron diffraction by the parent ion's potential to extract emission delay information.
- Measuring a 2D map of photoelectron emission delays in the molecular frame for core electrons in CO.
- Analyzing interference patterns generated by diffracted photoelectrons.
Main Results:
- Successfully measured photoelectron emission delays without requiring attosecond pulses.
- Demonstrated that emission times are highly dependent on the photoelectron's emission direction in the molecular frame.
- Observed characteristic changes in emission delays related to the molecule's shape resonance.
Conclusions:
- The developed method provides an alternative approach to studying ultrafast electron dynamics.
- Photoelectron emission delays are strongly correlated with molecular frame dynamics and electronic structure.
- This technique offers new insights into fundamental electron behavior in molecules.
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