Darmstadt 2008 – wissenschaftliches Programm

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K: Fachverband Kurzzeitphysik

K 3: Attosekundenpulse und höhere Harmonische (gemeinsam mit A und Q)

K 3.2: Vortrag

Montag, 10. März 2008, 17:00–17:15, 3C

Molecular orbital tomography using short laser pulses — •Elmar van der Zwan, Ciprian Chirila, and Manfred Lein — Institute for Physics, University of Kassel, Germany

Recently a method to perform tomographic imaging of molecular orbitals using high-harmonic generation has been proposed [1]. The method is based on the simplification that the returning electron in the three-step model can be modeled as a plane wave. Orbitals of arbitrary symmetry can be reconstructed if one uses extremely short laser pulses that ensure the continuum wave packet recombines from one side only. We compare two different forms for the reconstruction, and introduce an error-reduction algorithm that can be used to optimize the results. One of the challenges of the scheme lies in the accurate determination of the continuum wave packet. We determine the continuum wave packet in the Lewenstein model, assuming that the molecular orbital is known, and compare this with various methods to determine the continuum wave packet without knowledge of the orbital.

[1] J. Itatani, J. Levesque, D. Zeidler, H. Niikura, H. Pépin, J.C. Kieffer, P.B. Corkum and D.M. Villeneuve. Tomographic imaging of molecular orbitals. Nature 432, 867-871 (2004)