Hamburg 2009 – scientific programme
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A: Fachverband Atomphysik
A 11: Attosecond Physics I
A 11.1: Fachvortrag
Tuesday, March 3, 2009, 14:00–14:30, VMP 6 HS-B
Experimental molecular orbital tomography by attosecond electron wavepackets — •Stefan Haessler1, Willem Boutu1, Cecilia Giovanetti2, Jeremie Caillat2, Thierry Ruchon1, Hamed Merdji1, Pierre Breger1, Bertrand Carre1, Alfred Maquet2, Richard Taieb2, and Pascal Salieres1 — 1CEA-Saclay, IRAMIS, Service des Photons, Atomes et Molécules, 91191 Gif-sur-Yvette, France — 2UPMC Université Paris 06, LCPMR, 11 rue Pierre et Marie Curie, 75231 Paris, France
The strong interaction of a molecule with a laser field frees by tunnel ionization an attosecond electron wavepacket that probes its bound state half a laser cycle later as it recollides with the core. The information is encoded in the attosecond XUV burst emitted during recombination. Complete characterization of this observable gives access to the transition dipole moment over a large momentum span. With suitable assumptions on the EWP, the retrieval of the highest occupied molecular orbital (HOMO) as a function of space and time becomes possible.
We measured amplitudes and phases of the recombination dipole as a function of alignment angle for N2 and CO2 molecules by characterizing their attosecond emission with the RABITT technique. With these data, we successfully perform tomographic reconstructions of the HOMOs with a reduced set of assumptions as compared to the first demonstration by Itatani et al. Potentials and limitations of this technique will be discussed based on the deviations of the experimentally determined orbitals from theoretical ones.