Measuring the photoelectron emission delay in the molecular frame

How long does it take to emit an electron from an atom? This question has intrigued scientists for decades. As such emission times are in the attosecond regime, the advent of attosecond metrology using ultrashort and intense lasers has re-triggered strong interest on the topic from an experimental s...

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Published in:Nature communications 2021-11, Vol.12 (1), p.6657-6657, Article 6657
Main Authors: Rist, Jonas, Klyssek, Kim, Novikovskiy, Nikolay M., Kircher, Max, Vela-Pérez, Isabel, Trabert, Daniel, Grundmann, Sven, Tsitsonis, Dimitrios, Siebert, Juliane, Geyer, Angelina, Melzer, Niklas, Schwarz, Christian, Anders, Nils, Kaiser, Leon, Fehre, Kilian, Hartung, Alexander, Eckart, Sebastian, Schmidt, Lothar Ph. H., Schöffler, Markus S., Davis, Vernon T., Williams, Joshua B., Trinter, Florian, Dörner, Reinhard, Demekhin, Philipp V., Jahnke, Till
Format: Article
Language:English
Subjects:
639/766/36/1121
639/766/36/1122
Carbon monoxide
Diffraction patterns
Emission
Emission measurements
Energy
Humanities and Social Sciences
Infrared lasers
Ionization
Lasers
multidisciplinary
Photoelectrons
Photoionization
Physics
Science
Science (multidisciplinary)
Time measurement
Timing
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Summary:How long does it take to emit an electron from an atom? This question has intrigued scientists for decades. As such emission times are in the attosecond regime, the advent of attosecond metrology using ultrashort and intense lasers has re-triggered strong interest on the topic from an experimental standpoint. Here, we present an approach to measure such emission delays, which does not require attosecond light pulses, and works without the presence of superimposed infrared laser fields. We instead extract the emission delay from the interference pattern generated as the emitted photoelectron is diffracted by the parent ion’s potential. Targeting core electrons in CO, we measured a 2d map of photoelectron emission delays in the molecular frame over a wide range of electron energies. The emission times depend drastically on the photoelectrons’ emission directions in the molecular frame and exhibit characteristic changes along the shape resonance of the molecule. Measuring photoionization time delays is an interesting and challenging topic. Here the authors demonstrate a method to measure the photoionization time delays using inner-shell ionization of CO molecule.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-021-26994-2