Stuttgart 2012 – scientific programme

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A: Fachverband Atomphysik

A 39: Poster: Atomic clusters

A 39.2: Poster

Thursday, March 15, 2012, 16:30–19:00, Poster.V

Asymmetric ion emission from Xe-clusters in intense near-few-cycle-pulses — •Alexander Breier, Christian Peltz, and Thomas Fennel — Universität Rostock, 18051 Rostock, Germany

Atomic clusters in intense laser fields are an area of high interest for very different scientific areas, ranging from plasma physics to applied laser-matter research. Phenomena like high energy absorption, rapid cluster explosion, the emission of highly charged and energetic ions and fast electrons as well as the emission of energetic photons from the vacuum ultraviolet up to the xray range have been observed [1]. Most of the available data has been measured using relativly short pulses with durations τ >50 fs. The availability of even shorter pulses down to the few-cycle-regime makes it possible to explore new response regimes or even control the cluster dynamics. For example, enhanced ion emission in the laser polarization direction has been observed in the long pulse regime (many cycles)[2], whereas enhanced emission perpendicular to the polarization direction was found for near few-cycle excitation [3]. In this contribution we present a systematic molecular dynamics analysis of the ion emission from medium sized Xe-clusters in infrared laser pulses as function of laser intensity and pulse duration. Our analyses shows an energy-dependent anisotropy of the ion emission.

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

[2] V. Kumarappan et al, Phys. Rev. Lett. 87:85005 (2001)

[3] E. Skopalová et al., Phys. Rev. Lett. 104:203401 (2010)