Hannover 2013 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 22: Poster: Interaction with strong or short laser pulses
A 22.3: Poster
Dienstag, 19. März 2013, 16:00–18:30, Empore Lichthof
High-harmonic spectra of molecular hydrogen H2 — •Johann Förster, Yulian V. Vanne, and Alejandro Saenz — Institut für Physik, Humboldt-Universität zu Berlin, Germany
High-harmonic spectra of molecules are of steadily growing interest. However, full-dimensional theoretical ab-initio high-harmonic spectra of even the simplest multi-electron molecule H2 have (even for fixed nuclei) - to our knowledge - not yet been reported. The approach developed in our group [1-3] allows us to solve the time-dependent Schrödinger equation of the two-electron problem with a fixed internuclear distance in full dimensionality. This includes an arbitrary alignment of the molecule. Therefore, it is possible to examine how well widely used models work out in "reality" and how the expected structure (plateau, cutoff, etc.) is influenced by the use of spectral filters. We present high-harmonic spectra of H2 generated by ultrashort linear polarized laser pulses for different orientations of the laser polarization with respect to the molecular axis. Effects like the minimum in the high-harmonic spectra of "two-dimensional H2" [4] are thus reinvestigated in full dimensionality. Additionally, we compare our results with the ones obtained if we "turn on" the widely used single-active-electron approximation.
[1] Y.V. Vanne and A. Saenz, J. Phys. B 37, 4101 (2004).
[2] Y.V. Vanne and A. Saenz, J. Mod. Opt. 55, 2665 (2008).
[3] Y.V. Vanne and A. Saenz, Phys. Rev. A 82, 011403(R) (2010).
[4] M. Lein et al., Phys. Rev. Lett. 88, 183903 (2002).