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APS » Journals » Phys. Rev. Lett. » Volume 103 » Issue 12
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Phys. Rev. Lett. 103, 123005 (2009) [4 pages]

Molecular Dissociative Ionization and Wave-Packet Dynamics Studied Using Two-Color XUV and IR Pump-Probe Spectroscopy

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F. Kelkensberg1, C. Lefebvre2,3, W. Siu1, O. Ghafur1, T. T. Nguyen-Dang2, O. Atabek3, A. Keller3, V. Serov3, P. Johnsson1,4, M. Swoboda4, T. Remetter4, A. L’Huillier4, S. Zherebtsov7, G. Sansone5, E. Benedetti5, F. Ferrari5, M. Nisoli5, F. Lépine1,6, M. F. Kling1,7, and M. J. J. Vrakking1
1FOM Institute for Atomic and Molecular Physics (AMOLF), Science Park 113, 1098 XG Amsterdam, The Netherlands
2Département de chimie, Université Laval, Québec, G1K 7P4, Qc, Canada
3Laboratoire de Photophysique Moléculaire, Bâtiment 213, Campus d’Orsay, Université Paris-Sud 11, 91405 Orsay, France
4Department of Physics, Lund University, PO Box 118, SE-221 00 Lund, Sweden
5CNR-INFM, National Laboratory for Ultrafast and Ultraintense Optical Science, Department of Physics, Politecnico of Milan, Piazza L. da Vinci 32, 20133 Milano, Italy
6Université Lyon 1, CNRS, LASIM, UMR 5579, 43 bvd. du 11 Novembre 1918, F-69622 Villeurbane, France
7Max-Planck Institut für Quantenoptik, Hans-Kopfermann Strasse 1, D-85748 Garching, Germany

Received 2 July 2009; published 17 September 2009

See accompanying Physics Synopsis

We present a combined theoretical and experimental study of ultrafast wave-packet dynamics in the dissociative ionization of H2 molecules as a result of irradiation with an extreme-ultraviolet (XUV) pulse followed by an infrared (IR) pulse. In experiments where the duration of both the XUV and IR pulses are shorter than the vibrational period of H2+, dephasing and rephasing of the vibrational wave packet that is formed in H2+ upon ionization of the neutral molecule by the XUV pulse is observed. In experiments where the duration of the IR pulse exceeds the vibrational period of H2+ (15 fs), a pronounced dependence of the H+ kinetic energy distribution on XUV-IR delay is observed that can be explained in terms of the adiabatic propagation of the H2+ wave packet on field-dressed potential energy curves.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.103.123005
DOI:
10.1103/PhysRevLett.103.123005
PACS:
33.80.Gj, 33.20.Tp, 42.50.Md, 82.53.Eb
 
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