Berlin 2005 – wissenschaftliches Programm
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A: Atomphysik
A 13: Poster HU 2
A 13.20: Poster
Dienstag, 8. März 2005, 08:30–18:30, Poster HU
Correlated multi-electron dynamics in ultrafast laser - atom interactions — •Artem Rudenko1, Bernold Feuerstein1, Karl Zrost1, Thorsten Ergler1, Vitor L.B. de Jesus2, Claus Dieter Schröter1, Robert Moshammer1, and Joachim Ullrich1 — 1Max-Planck-Institut für Kernphysik, Heidelberg, Germany — 2Centro Federal de Educacao Tecnologica, Rio de Janeiro, Brazil
Multiple ionization of Ne and Ar by strong 25 and 7 fs laser pulses has been studied using a dedicated combined recoil-ion and electron momentum spectrometer. High resolution ion momentum distributions for double, triple and four-fold ionization as well as coincident electron spectra will be presented. For the case of a Ne target we find that essentially only one pathway contributes to multiple electron removal, namely the instantaneous emission of up to four electrons due to recollision of the first ionized electron with the singly charged parent ion. Surprisingly, triply and four-fold charged ions are predominantly produced by highly correlated sub-cycle few-electron emission even at those intensities where the dominating mechanism of double ionization does not involve electron correlation. In Ar, instead, different types of less correlated multi-electron pathways involving recollisional induced excitation and cascades of sequential and non-sequential processes are important. By using few-cycle pulses we were able to suppress such processes that occur on time scales longer than one laser cycle.