Mainz 2017 – scientific programme

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A: Fachverband Atomphysik

A 31: Poster Session III

A 31.40: Poster

Thursday, March 9, 2017, 17:00–19:00, P OG1

Population inversion in atomic clusters — •Andreas Rubisch, Ulf Saalmann, and Jan-Michael Rost — Max Planck Institute for the Physics of Complex Systems, Dresden, Germany

High harmonic generation in intense laser pulses is a valuable tool to obtain radiation in the UV and x-ray regime. In order to overcome the typically low conversion efficiency, it was proposed to assist the emission of high harmonics in single atoms or molecules by an intense near-infrared (NIR) driving pulse [1].

Such a mechanism could be powerful in atomic clusters as well. There the NIR pulse generates a nano-plasma, which, however, is highly unstable upon evaporation. Here we study helium droplets doped with a handful of xenon atoms, where by means of dopant-induced ignition a lower-temperature nano-plasma is formed [2,3].

We perform classical molecular-dynamics calculations in order to quantify the competition between population inversion and subsequent recombination on one hand and evaporation through electron-electron collisions on the other hand.

[1] T. Bredtmann et al., PRA 93, 021402(R) (2016)

[2] A. Mikaberidze et al., PRL 102, 128102 (2009)

[3] S.R. Krishnan et al. PRL 107, 173402 (2011)