Parts | Days | Selection | Search | Downloads | Help
A: Fachverband Atomphysik
A 8: Interaction with intense laser pulses II: Molecules and beyond
A 8.3: Talk
Tuesday, March 11, 2008, 14:45–15:00, 3C
Ionization and fragmentation of C60 fullerenes as a function of the fs laser light ellipticity — •Ihar Shchatsinin1, Tim Laarmann1, Nick Zhavoronkov1, Claus Peter Schulz1, and Ingolf Volker Hertel1,2 — 1Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Max-Born-Str. 2a, D-12489 Berlin, Germany — 2Department of Physics, Free University Berlin, Arnimallee 14, D-14195 Berlin, Germany
The C60 fullerene is an interesting model to study the interaction dynamics of a large but finite system with strong laser fields. In the current work we have investigated the effect of the laser radiation ellipticity on the ionization and fragmentation of C60 utilizing both time-of-flight mass and photoelectron spectroscopy. A strong influence of the light ellipticity on the formation of fragments and parent ions was found for 27 fs laser pulses centred at 800 nm in the intensity range between 0.5×1014 W/cm2 and 4.3×1014 W/cm2. For the lower laser intensities photo ionization and photo fragmentation yields decrease with increasing ellipticity, while for the highest laser intensities the yields show a rise when the laser polarization is changed from linear to circular. It clearly indicates that recollisions during the strong field excitation can play only a minor role under the present experimental conditions. Possible theoretical models explaining these results will be discussed in detail. Comparison between the experimental observations and theoretical description allows to obtain new information about properties of C60 and to make a further step towards full understanding of fs laser induced dynamics in large and complex systems.