Dresden 2011 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 18: Interaction with strong or short laser pulses I

A 18.1: Vortrag

Mittwoch, 16. März 2011, 16:30–16:45, BAR 106

Controlling quantum beat structures in the photoionization continuum of neon — •Henning Geiseler, Horst Rottke, Günter Steinmeyer, and Wolfgang Sandner — Max-Born-Institut, Max-Born-Str. 2a, 12489 Berlin

The coherent excitation of an ensemble of high lying bound states in an atomic system by an ultrashort XUV pulse, followed by ionization of these states with a delayed IR probe pulse leads to quantum beats in the delay dependent photoelectron spectrum. We performed measurements of these quantum beats in neon, observing a dependence on the ionization pulse intensity. To account for this dependence, we developed a model that involves an IR laser pulse induced coupling of the bound states, which are excited by the XUV pulse, to a lower lying state in the neon atom.