Heidelberg 2015 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 10: Poster: Interaction with strong or short laser pulses

A 10.4: Poster

Montag, 23. März 2015, 17:00–19:00, C/Foyer

Double-slit electron interference in strong-field ionization of argon dimers — Kevin Henrichs, Nikolai Schlott, •Alexander Hartung, Maksim Kunitski, and Reinhard Dörner — Institut für Kernphysik, Goethe Universität Frankfurt, Max-von-Laue-Str. 1, D-60438 Frankfurt am Main, Germany

Wave-like behavior of particles, e.g. interference, is “the mystery”, as stated by Feynman, “which is impossible, absolutely impossible, to explain in any classical way, and which has in it the heart of quantum mechanics”. In the 1960s it was realized that the double-slit experiment can be performed at the molecular level by exploiting two sites of a diatomic molecule as coherent electron emitters [1]. Several such experiments have been reported so far [2-6].

Here we report the observation of photo-electron double-slit interference in single ionization of argon dimer by a strong ultra-short laser field (40 fs, 790 nm, 1.8·10¹⁴ W/cm²). An electron and a single Ar ion resulting from break-up of Ar₂⁺ along the repulsive II(1/2)_g potential were measured in coincidence by means of COLd Target Recoil Ion Momentum Spectroscopy (COLTRIMS) [7]. The molecular axis of Ar₂ upon ionization was deduced from the momentum direction of the detected Ar ion. [1] H. D. Cohen, U. Fano, Phys Rev 150, 30-33 (1966) [2] D. Rolles et al., Nature 437, 711-715 (2005) [3] X.-J. Liu et al., J. Phys. B At. Mol. Opt. Phys. 39, 4801 (2006) [4] D. Akoury et al., Science 318, 949-952 (2007) [5] Z. Ansari et al., New J. Phys. 10, 093027 (2008) [6] S. E. Canton et al., Proc. Natl. Acad. Sci. 108, 7302-7306 (2011) [7] J. Ullrich et al., Rep. Prog. Phys. 66, 1463 (2003).