Quantum beat oscillations in the two-color-photoionization continuum of neon and their dependence on the intensity of the ionizing laser pulse

Henning Geiseler, Horst Rottke, Günter Steinmeyer, and Wolfgang Sandner
Phys. Rev. A 84, 033424 – Published 29 September 2011

Abstract

We investigate quantum beat oscillations in the photoionization continuum of Ne atoms that are photoionized by absorption of two photons via a group of excited bound states using ultrashort extreme ultraviolet and infrared laser pulses. The extreme ultraviolet pulse starts an excited-state wave packet that is photoionized by a high-intensity infrared pulse after a variable time delay. We analyze the continuum quantum beats from this two-step photoionization process and their dependence on the photoelectron kinetic energy. We find a pronounced dependence of the quantum beat amplitudes on the photoelectron kinetic energy. The dependence changes significantly with the applied infrared laser-pulse intensity. The experimental results are in good qualitative agreement with a model calculation that is adapted to the experimental situation. It accounts for the intensity dependence of the quantum beat structure through the coupling of the excited-state wave packet to other bound Ne states induced by the high-intensity infrared laser pulse.

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  • Received 22 July 2011

DOI:https://doi.org/10.1103/PhysRevA.84.033424

©2011 American Physical Society

Authors & Affiliations

Henning Geiseler, Horst Rottke, Günter Steinmeyer, and Wolfgang Sandner

  • Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, Max-Born-Straße 2 A, D-12489 Berlin, Germany

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Issue

Vol. 84, Iss. 3 — September 2011

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