Media type: Text; E-Article Title: Two-center interference and ellipticity in high-order harmonic generation from H2+ Contributor: van der Zwan, Elmar V. [Author]; Lein, Manfred [Author] Published: College Park, MD : American Physical Society, 2010 Published in: Physical Review A 82 (2010), Nr. 3 Issue: published Version Language: English DOI: https://doi.org/10.15488/1974; https://doi.org/10.1103/PhysRevA.82.033405 Keywords: Alignment angle ; Emitted radiation ; Gaussian Wave Packets ; Harmonic generation ; Theoretical investigations ; Polarization direction ; Alignment ; Wave packets ; Harmonic analysis ; High order harmonic generation ; Trajectories ; Laser fields ; Single electronics ; Waves ; Coulombic potentials ; Two-center interference ; Laser induced Origination: Footnote: Diese Datenquelle enthält auch Bestandsnachweise, die nicht zu einem Volltext führen. Description: We present a theoretical investigation into the two-center interference in aligned H2+. The influence of the laser field on the recombination step is investigated by comparing laser-induced harmonic generation with harmonic generation from field-free collisions of Gaussian wave packets with the core. We find that for different Gaussian wave packets colliding with the molecule, the interference minimum occurs at the same alignment angle. The same result is obtained for the laser-induced spectrum when only a single electronic trajectory per harmonic contributes. When multiple electronic trajectories contribute, we find an effect on the minimum position because the interference between short and long trajectories is alignment dependent. The two-center interference and the influence of the Coulombic potential are clearly seen not only in the harmonic intensity and phase but also in the polarization direction and ellipticity. We observe significant ellipticity of the emitted radiation around the two-center interference minimum. © 2010 The American Physical Society. ; DFG/EXC/QUEST ; European Marie Curie Initial Training Network Access State: Open Access