Hamburg 2009 – scientific programme
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A: Fachverband Atomphysik
A 34: Poster II
A 34.47: Poster
Thursday, March 5, 2009, 16:30–19:00, VMP 9 Poster
Excited neutral fragments in strong field dissociation of molecules — •Thomas Nubbemeyer1, Ulli Eichmann1,2, Bastian Manschwetus1, Horst Rottke1, Günter Steinmeyer1, and Wolfgang Sandner1,2 — 1Max-Born-Institut, Berlin, Germany — 2Technische Universität Berlin, Germany
We have measured excited neutral fragments with energies of up to 15eV from the strong field dissociation of small molecules (H2, N2, CO). The kinetic energy spectra of the excited fragments correspond to those fragmentation processes yielding singly charged ionic fragments, e.g. from the Coulomb explosion in N2 and H2 or bond softening in H2. This suggests that the production of neutral excited fragments results from a recapture process of an electron into a Rydberg state by one of the repelling fragment ions. The dependence of the neutral excited fragment yield on the ellipticity of the laser polarization and correlated measurements of ionic and excited neutral fragments yield further evidence for the suggested model. Finally, classical trajectory calculations within the rescattering model are presented which provide theoretical support.