Düsseldorf 2007 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 9: Interaction with strong laser pulses II
A 9.5: Vortrag
Dienstag, 20. März 2007, 15:15–15:30, 5M
Plasmon-enhanced multiple ionization C60 in intense short pulse laser fields down to 9 fs — •Ihar Shchatsinin, Tim Laarmann, Gero Stibenz, Günter Steinmeyer, Andrei Stalmashonak, Nickolai Zhavoronkov, Claus Peter Schulz, and Ingolf Volker Hertel — Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Max-Born-Str. 2A 12489 Berlin-Adlershof, Germany
The interaction of C60 fullerenes with 800 nm laser pulses as short as 9 fs at intensities up to 4×1014 Wcm−2 is investigated with photoion spectroscopy. The excitation time lies well below the characteristic time for electron - electron and electron - phonon coupling. Thus, energy deposition into the system is much shorter than the energy redistribution among the various electronic and nuclear degrees of freedom. The observations indicate that for final charge states q>1 the C60 giant plasmon resonance is involved in the absorption process and a significant amount of large fragments is created through non-adiabatic multi-electron dynamics (NMED) even with 9 fs pulses [1]. In contrast, singly charged ions are generated by an essentially adiabatic single active electron mechanism (SAE) and negligible fragmentation is found when 9 fs pulses are used. These findings promise to unravel a long standing puzzle in understanding C60 mass spectra generated by intense fs laser pulses.
[1] I. Shchatsinin, T. Laarmann, G. Stibenz, G. Steinmeyer, A. Stalmashonak, N. Zhavoronkov, C. P. Schulz and I. V. Hertel, J. Chem. Phys. 125 (2006) 194320/1-15