Open Access
UVX 2008
UVX 2008 - 9e Colloque sur les Sources Cohérentes et Incohérentes UV, VUV et X ; Applications et Développements Récents
Page(s) 65 - 70
Publié en ligne 7 juillet 2009
UVX 2008 (2009) 65-70
DOI: 10.1051/uvx/2009011

Measuring the complex recombination dipole of aligned CO2 molecules in high-order harmonic generation

S. Haessler1, W. Boutu1, H. Merdji1, P. Breger1, R. Taïeb2, 3, J. Caillat2, 3, A. Maquet2, 3, P. Monchicourt1, B. Carré1 and P. Salières1

1  CEA Saclay, IRAMIS, Service des Photons, Atomes et Molécules, 91191 Gif-sur-Yvette, France
2  UMPC Univ. Paris 06, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, 11 rue Pierre et Marie Curie, 75231 Paris Cedex 05, France
3  CNRS, UMR 7614, LCPMR, 75005 Paris, France

Published online: 7 July 2009

We generate high order harmonics in aligned CO2 molecules and measure the spectral amplitudes and phases as a function of the alignment angle. We control the quantum interference occurring in the recombination of an ultrafast laser-driven electron wavepacket with the highest occupied molecular orbital of CO2. By comparing to the emission of the reference system krypton, we obtain an experimental measure of the complex recombination dipole matrix element between the CO2 HOMO and a continuum state. The measured phase jump contains signatures of Coulombic wavepacket distortion.

© EDP Sciences 2009

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