C$_{60}$ in intense femtosecond laser pulses: plasmon excitation and multiphoton ionization

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  • 14 June 2001
Abstract
We study the interaction of strong femtosecond laser pulses with the C$_{60}$ molecule employing time-dependent density functional theory with the ionic background treated in a jellium approximation. The laser intensities considered are below the threshold of strong fragmentation but too high for perturbative treatments such as linear response because of ionization and higher order processes. The nonlinear response of the model to excitations by pulses of frequencies up to 45\,eV is presented. With the help of Kohn-Sham orbital resolved dipole spectra the formation of collective resonances is analyzed. In femtosecond laser pulses of 800\,nm wavelength ionization is found to occur multiphoton-like rather than via plasmon excitation.

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