Frankfurt 2006 – scientific programme

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MO: Molekülphysik

MO 42: Excitation and Coherence Decay

MO 42.1: Talk

Wednesday, March 15, 2006, 14:00–14:15, H12

Photoinduced multielectron dynamics in large finite systems: A two-color pump-probe mass-spectroscopic study on C₆₀ — •I. Shchatsinin, T. Laarmann, A. Stalmashonak, N. Zhavoronkov, C. P. Schulz, and I. V. Hertel — Max-Born-Institute, Max-Born Str. 2a, D-12489 Berlin, Germany

C₆₀ fullerenes may be seen as a prototype of a large, finite system for investigations of the electronic and nuclear responses in strong laser field [1]. We have studied the ionization and fragmentation dynamics of C₆₀ with time-resolved, two-color, pump-probe spectroscopy using sub-30-fs pulses of 400 nm (pump) and 800 nm (probe) wavelength. The recorded signals of mother ions and fragments as a function of the delay time between pump and probe pulses and as a function of their laser intensities (5 × 10¹²-1 × 10¹⁴ Wcm⁻²) contain information on the energy redistribution within the molecule. The resonant pre-excitation of the ”t_1u-doorway” state by a weak, blue pulse results in a significant enhancement of highly charged mother ions and fragments by the strong, delayed probe pulse. The observed ultrafast dynamics will be discussed in the picture of nonadiabatic multi-electron dynamics (NMED) which is currently of great interest.
I. V. Hertel, T. Laarmann, and C. P. Schulz, Ad. At. Mol. and Opt. Phys. 50, 219 (2005)