Berlin 2001 – wissenschaftliches Programm
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A: Atomphysik
A 5: Posters Tuesday (Photoionisation, Multi Photon Processes)
A 5.25: Poster
Dienstag, 3. April 2001, 12:30–15:00, AT3
Momentum analysis of strong field fragmentation of H2 — •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
We used COLd Target Recoil Ion Momentum Spectroscopy (COLTRIMS) to investigate the fragmentation of molecular hydrogen exposed to high intensity (I > 1014 W/cm2), linearly polarized, ultra–short light pulses (τp = 25 fs). The final momenta of the charged particles were analysed for the reaction channels: H2 → H2+ + e− (1), H2 → H(1s) + H+ + e− (2), and H2 → H+ + H+ + e− + e− (3). The momentum distribution f(p1→,p2→) of the two photoelectrons emitted in reaction (3) indicates that the momenta they gain in the double ionization process are not correlated. For reaction (2) the momentum distribution of H+ ions emitted along the light polarization vector is independent of the kinetic energy of the photoelectron. This indicates that the momentum the ion gains does not depend significantly on the intensity level in the light pulse, measured by the electron kinetic energy, when reaction (2) is initiated.