Berlin 2005 – wissenschaftliches Programm

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MO: Molekülphysik

MO 42: Poster II

MO 42.4: Poster

Dienstag, 8. März 2005, 14:00–16:00, Poster HU

Double ionization of N₂ and O₂ in intense laser field — •Stefan Voss^1,2, A. S. Alnasar², X.-M. Tong², T. Osipov², B. Ulrich^1,2, C. D. Lin², H. Schmidt-Böcking², R. Dörner², and C. L. Cocke¹ — ¹Institut für Kernphysik (IKF), August-Euler-Str.6, D-60486 Frankfurt, Germany — ²J.R. Macdonald Laboratory, Physics Department, Kansas State University, Manhattan, KS, 66502, U.S.A.

Different ionization processes can be identified by measuring the full momentum vectors of coulomb exploding N⁺ or O⁺ fragments in coincidence using cold target recoil ion momentum spectroscopy (COLTRIMS). We measured high resolution kinetic energy release spectra and show angular dependences for double ionized N₂ and O₂ molecules with laser peak intensities between 1 and 20· 10¹⁴ W/cm². We find that the process proceeds through well defined electronic states of the excited molecular dications. Using linear and circularly polarized light, we identify two mechanisms for the production of theses states, rescattering and sequential ionization. By using 8 fs pulses, we observe that the internuclear distance can be frozen during the pulse.