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Related Experiment Video

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

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

Published on: July 27, 2018

Attosecond control of ionization by wave-packet interference.

P Johnsson¹, J Mauritsson, T Remetter

¹Department of Physics, Lund University, P.O. Box 118, SE-221 00 Lund, Sweden. per@eng-johnsson.se

Physical Review Letters

|February 1, 2008

Summary

Researchers used synchronized infrared and attosecond laser fields to control electron wave packets in helium. This attosecond wave-packet interference, observed for the first time, strongly influences ionization probability.

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Area of Science:

Atomic Physics
Quantum Mechanics
Ultrafast Science

Background:

Attosecond pulses enable probing ultrafast electron dynamics.
Controlling electron behavior is crucial for understanding atomic and molecular processes.
Previous studies explored electron wave packet manipulation, but interference in driven systems remained elusive.

Purpose of the Study:

To investigate attosecond wave-packet interference in helium.
To demonstrate control over ionization probability using synchronized laser fields.
To observe and explain the mechanism behind oscillatory ionization.

Main Methods:

Generating a train of attosecond pulses synchronized to an infrared laser field.
Creating electron wave packets below the ionization threshold in helium.
Measuring ionization probability as a function of the delay between laser fields.
Performing theoretical calculations to model the observed phenomena.

Main Results:

Ionization probability strongly oscillates twice per infrared laser cycle.
Observed oscillations are attributed to interference between transiently bound electron wave packets.
Experimental results are reproduced by theoretical calculations.
First observation of attosecond wave-packet interference in a strongly driven atomic system.

Conclusions:

Attosecond wave-packet interference provides a mechanism for controlling ionization in atomic systems.
The study demonstrates a novel method for manipulating electron dynamics with attosecond precision.
This work opens new avenues for exploring quantum phenomena in driven atomic targets.