Berlin 2001 – wissenschaftliches Programm
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A: Atomphysik
A 5: Posters Tuesday (Photoionisation, Multi Photon Processes)
A 5.26: Poster
Dienstag, 3. April 2001, 12:30–15:00, AT3
Strong field double ionization of Ne and Ar — •H. Rottke1, C. Trump1, M. Wittmann1, G. Korn1, W. Sandner1, R. Moshammer2, A. Dorn2, C.D. Schröter2, D. Fischer2, J. Crespo2, B. Feuerstein2, J. Ullrich2, and P. Neumeier3 — 1Max-Born-Institut, Max-Born-Str. 2a, D-12489 Berlin — 2Fak. für Physik, Univ. Freiburg, Hermann-Herder-Str. 3, D-79104 Freiburg — 3Gesellschaft für Schwerionenforschung, Planckstr. 1, D-64291 Darmstadt
COLd Target No-dqRecoilNo-dq Ion Momentum Spectroscopy (COTRIMS) was used to investigate atomic double ionization in high intensity (I > 1014 W/cm2) ultra–short infrared (λ = 790 nm) light pulses (τp = 25 fs). The complete kinematical analysis of the motion of the charged particles in the final state along the polarization vector of the light beam allowed to identify electronic rescattering as the main mechanism responsible for non-sequential atomic double ionization which is found in a certain range of intensities. The results for Ne and Ar show distinct differences which indicate pure rescattering as mechanism for Ne. In case of Ar mechanisms other than rescattering also seem to contribute to non-sequential ionization. A transition from non-sequential to sequential double ionization with rising light intensity is clearly visible in the data.