Attosecond Control of Ionization Dynamics

Abstract

Attosecond pulses can be used to initiate and control electron dynamics on a sub-femtosecond time scale. The first step in this process occurs when an atom absorbs an ultraviolet photon leading to the formation of an attosecond electron wave packet (EWP). Until now, attosecond pulses have been used to create free EWPs in the continuum, where they quickly disperse. In this paper we use a train of attosecond pulses, synchronized to an infrared (IR) laser field, to create a series of EWPs that are below the ionization threshold in helium. We show that the ionization probability then becomes a function of the delay between the IR and attosecond fields. Calculations that reproduce the experimental results demonstrate that this ionization control results from interference between transiently bound EWPs created by different pulses in the train. In this way, we are able to observe, for the first time, wave packet interference in a strongly driven atomic system.

8 pages, 4 figures

Cited by in corpus (24)

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• Theory of Auger decay by laser-dressed atoms
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• Laser-assisted photoionization of argon atoms: streaking, sideband and pulse train studying cases
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• A semi-classical approach for solving the time-dependent Schrödinger equation in spatially inhomogeneous electromagnetic pulses
• Attosecond light pulse induced photo-association
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• Atomic and Molecular Systems Driven by Intense Chaotic Light
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