Hannover 2013 – scientific programme

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A: Fachverband Atomphysik

A 9: Interaction with strong or short laser pulses I

A 9.3: Talk

Monday, March 18, 2013, 17:15–17:30, B 305

Time-dependent density functional calculations of enhanced fast electron emission from laser-irradiated sodium clusters — •Thomas Keil and Dieter Bauer — Institut für Physik, Universität Rostock, 18051 Rostock

The investigation of clusters promises insight into the transition from atomic systems to the bulk material. Moreover, this transient regime gives rise to a variety of phenomena driven by collective effects in small systems subject to intense laser pulses [1,2], such as enhanced absorption and scattering of radiation and modified cut-offs in photoelectron spectra.

We study the interaction between short intense laser pulses and sodium clusters. A comparison with the hydrogen atom shows that for clusters the emission of fast electrons is significantly increased. This effect is studied using time-dependent density functional theory and a jellium cluster model.

We calculate electron energy spectra to show correlations between electron-electron interaction and the effect of increased fast electron emission. We identify collective effects in the multipole-expanded interaction potentials and characterize the underlying acceleration mechanism.

[1] Th. Fennel et al., Rev. Mod. Phys. 82, 1793 (2010).

[2] Th. Fennel et al., Phys. Rev. Lett. 98, 143401 (2007).