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Related Experiment Video

Updated: Jun 3, 2026

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−

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Published on: July 27, 2018

Decoherence in attosecond photoionization.

Stefan Pabst¹, Loren Greenman, Phay J Ho

¹Center for Free-Electron Laser Science, DESY, Notkestrasse 85, 22607 Hamburg, Germany.

Physical Review Letters

|March 17, 2011

Summary

Single-photon ionization creates superpositions of hole states. Interchannel coupling reduces ion coherence, preventing perfectly coherent hole wave packets even with broad-bandwidth pulses.

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Published on: August 6, 2018

Area of Science:

Quantum dynamics
Atomic physics
Attosecond science

Background:

Single-photon ionization is a fundamental process in atomic physics.
Attosecond extreme-ultraviolet (XUV) pulses enable the study of ultrafast electron dynamics.
Understanding hole state coherence is crucial for controlling photoionization processes.

Purpose of the Study:

Investigate the creation of superpositions of hole states in atomic xenon using attosecond XUV pulses.
Quantify the degree of coherence between these hole states.
Examine the role of interchannel coupling in influencing coherence.

Main Methods:

Time-dependent configuration-interaction singles (TDCIS) method.
Simulations of single-photon ionization of atomic xenon.
Analysis of photoelectron-hole state entanglement and coherence.

Main Results:

Interchannel coupling significantly affects hole state populations.
Entanglement between the photoelectron and the ion is enhanced by interchannel coupling.
This entanglement reduces the coherence within the ion.
Perfectly coherent hole wave packets cannot be formed, even with spectral bandwidth exceeding energy splittings.

Conclusions:

Interchannel coupling is a key factor limiting hole state coherence in photoionization.
The formation of coherent hole wave packets is hindered by photoelectron-ion entanglement.
Increasing mean photon energy can enhance coherence for sufficiently large spectral bandwidths.