Berlin 2014 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 15: Poster: Interaction with strong or short laser pulses
A 15.12: Poster
Montag, 17. März 2014, 16:30–18:30, Spree-Palais
Contributions from different orbitals to the high-harmonic spectra of N2 — •Étienne Plésiat1, Piero Decleva2, and Alejandro Saenz1 — 1AG Modern Optics, Institut für Physik, Humboldt-Universität zu Berlin, Newtonstraße, 15, 12489 Berlin, Germany — 2Dipartimento di Scienze Chimiche, Universita’ di Trieste, Via L. Giorgieri 1, 34127 Trieste, Italy
In the last decade, high-harmonic generation (HHG) is supposed to become a fantastic tool for obtaining information about the electronic and geometric structure of molecules on the ultrafast time scale. Since the rate of the tunnel ionization depends exponentially on the ionization potential, the HHG spectra were thought to reflect the contribution of the highest occupied molecular orbital (HOMO) only. However, in 2008 the predominance of the HOMO−1 of N2 in the cut-off region has been observed for the first time [1]. From then on, a particular attention has been payed to the contributions of molecular orbitals with lower binding energies. They have been shown to be responsible for dynamical minima in the plateau region of CO2 [2]. Theoretical studies generally employ models based on the strong-field approximation (SFA) which are computationally fast but sometimes also inaccurate. In this work, we investigated the multiple-orbital contributions to the HHG spectra of N2 by solving the TDSE in the single-determinant approximation in a basis of Kohn-Sham orbitals. Accurate results obtained with this method will be presented during the conference.
[1] B. K. McFarland et al., Science 322, 1232 (2008).
[2] O. Smirnova et al., Nature 460, 972, (2009).