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A: Fachverband Atomphysik

A 17: Interaction with strong or short laser pulses II

A 17.1: Hauptvortrag

Dienstag, 19. März 2013, 14:00–14:30, B 302

Ultrafast dynamics in molecular systems and clusters — •Maria Krikunova¹, Theophilos Maltezopoulos², Philipp Wessels², Ulrike Frühling², Marek Wieland², Markus Drescher², Alaa Al-Shemmary³, Nikola Stojanovic³, Maria Müller¹, Jan P. Müller¹, Bernd Schütte⁴, and Thomas Möller¹ — ¹Technische Universität, Berlin — ²Universität Hamburg — ³HASYLAB, DESY — ⁴Max-Born-Institut Berlin

Intense light fields can produce highly excited non-equilibrium states of matter ultimately causing the explosion of molecules and nanoparticles into atomic fragments. Understanding these processes in even simple systems is challenging because it requires experiments that can follow the dynamics on extremely short time-scales. Novel light sources, such as the free-electron laser (FEL) facility in Hamburg, FLASH, now deliver synchronized ultra-short pulses in the soft X-ray, near-infrared (NIR) and far-infrared (terahertz, THz) spectral ranges allowing the realization of new types of pump-probe schemes.

Due to the different interaction mechanisms of pump and probe pulses with the target the tracing of dynamical details within the envelope of the exciting pulse itself becomes possible. With the soft X-ray pulses from FLASH we were able to track the electron redistribution in iodine molecules exposed to a strong NIR field. Utilization of a THz-field driven streak camera principle allowed the access to nanoplasma dynamics in rare gas clusters upon ionization with soft X-ray FEL pulses.