Berlin 2014 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 15: Poster: Interaction with strong or short laser pulses
A 15.13: Poster
Montag, 17. März 2014, 16:30–18:30, Spree-Palais
Two-color pump–probe momentum spectroscopy on dissociative photo-ionization of molecular nitrogen. — •Philipp Cörlin1, Alexander Sperl1, Andreas Fischer1, Michael Schönwald1, Arne Senftleben2, Thomas Pfeifer1, Joachim Ullrich3, and Robert Moshammer1 — 1Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg — 2Universität Kassel, Heinrich-Plett-Str. 40, 34132 Kassel — 3Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig
Molecular nitrogen (N2) has been investigated in an extreme-ultraviolet (XUV)–infrared (IR) pump–probe experiment using attosecond pulse trains with photon energies between 20 eV and 40 eV to ionize N2 into several binding and anti-binding electronic states. An additional, time delayed 15 fs IR pulse with a center-wavelength of 780 eV is used to modify and probe these states.
The three dimensional momenta of coincident photo-electrons and ions N2+ and N+ are detected over the full solid angle using a Reaction Microscope. This allows to study electron-ion energy-correlations and molecular frame photo-electron angular distributions for dissociative channels and thereby identify the involved N2+ states by energy and symmetry. Of particular interest is the ionization into vibrational levels of the bound C2Σ+u state that for k≥3 dissociate into N+ + N via predissociation which has been studied in synchrotron experiments for many years (compare [1] and references therein). In our experiment the energies of these vibrational states have been measured.
L.-E. Berg et al., Phys. Scr. 44, (1991), 131-137