Hannover 2010 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 21: Interaction with Strong or Short Laser Pulses I
A 21.2: Vortrag
Donnerstag, 11. März 2010, 14:30–14:45, F 107
On the Interference Picture in Molecular Intense-Laser Field Ionization — Yulian V. Vanne and •Alejandro Saenz — AG Moderne Optik, Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin
The solution of the complete time-dependent Schrödinger equation describing atoms or even molecules in ultrashort intense laser pulses is still limited to very small systems. In fact, only recently it became possible to describe both electrons of a hydrogen molecule exposed to an intense 800 nm laser pulse. However, these calculations were restricted to a parallel orientation of the molecular axis with respect to the laser field, reducing the dimensionality due to the preserved cylindrical symmetry. For the first time, we have now overcome this limitation and have investigated the alignment dependence of the strong-field ionization of H2.
This work focuses on two aspects. First, the ratio of parallel to perpendicular ionization yields is calculated and compared to a recent experiment. Second, it is shown that a simple but popular interference picture suggested by a simplified intense-field ionization model, the strong-field approximation formulated in velocity gauge, can be tested with the aid of energy-resolved electron spectra obtained for a parallel and a perpendicular orientation. It is demonstrated that the interference picture is not supported by the full two-electron calculation.