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41 st EGAS PR 2 Gdańsk 2009 Nonlinear resonances and dynamics of atomic Bose-Einstein condensates Janne Ruostekoski School of Mathematics, <strong>University</strong> of Southampton, Southampton, SO17 1BJ, UK E-mail: J.Ruostekoski@soton.ac.uk We investigate nonlinear dynamics of atomic Bose-Einstein condensates which provide an ideal system to study the effect of atomic interactions on delta-kicked atoms. The signatures of nonlinear dynamics appear in abrupt cutoff on leading resonances which is due to an excitation path combining both Beliaev and Landau processes. Other manifestations of dynamical instabilities in nonlinear condensate evolution, such as phase separation, soliton formation and the effect of critical flow velocities, may be studied in static optical lattices. 52
41 st EGAS PR 3 Gdańsk 2009 Few-electron dynamics in intense short XUV pulses studied with coincident momentum spectroscopy Artem Rudenko Max Planck Advanced Study Group at CFEL, Nottkestrasse 85, 22607 Hamburg, Germany E-mail: a.rudenko@asg.mpg.de The emission of few electrons from atoms, molecules, clusters or solids constitutes one of the most fundamental processes occurring when intense VUV or X-ray radiation interacts with matter. Recent development of the Free electron LASer in Hamburg (FLASH), delivering femtosecond VUV light pulses at unprecedented intensities along with the progress in high-harmonics generation made multi-photon multi-electron transitions in this energy range experimentally accessible, triggering enormous theoretical interest and opening the way for a variety of time-resolved imaging schemes. N ++ kinetic energy / eV delay / fs Figure 1: Kinetic energy of N 2+ ions as a function of the delay between two 38 eV pump- and probe pulses delivered by FLASH Here an overview of recent experimental studies on few-photon-induced fragmentation of rare gas atoms and simple diatomic molecules performed at FLASH employing coincident cold-target recoil ion and electron momentum spectroscopy will be presented. Particular examples include a disentanglement of sequential and direct (’non-sequential’) pathways for few-photon double ionization of Ne and He [1], identification of dissociation and Coulomb explosion channels in FEL-induced fragmentation of simple diatomic molecules (N2, O2, D2) [2], and the results of the first VUV-VUV pump-probe experiments. As illustrated in Fig. 1, the latter measurements not only allow for a time-resolved mapping of fragmenting molecular states, but also yield valuable information on the properties of the FEL pulse via channel-selective analyses of autocorrelation-like patterns. References [1] A. Rudenko et al., Phys. Rev. Lett. 101, 073003 (2008) [2] Y. Jiang et al., Phys. Rev. Lett. 102, 123002 (2009) 53
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Author Index Abdel-Aty M., 72 Adamo
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