Mainz 2017 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 39: Clusters III (with MO)

A 39.4: Vortrag

Freitag, 10. März 2017, 15:30–15:45, N 3

Time-resolved photoelectron spectroscopy on resonantly excited He nanodroplets — •A. C. LaForge¹, Y. Ovcharenko², B. Langbehn², O. Plekan³, R. Cucini³, P. Finetti³, D. Iablonskyi⁴, A. Clark⁵, V. Oliver Álvarez de Lara⁵, P. Piseri⁶, T. Nishiyama⁷, M. Di Fraia³, C. Callegari³, K. C. Prince³, K. Ueda⁴, F. Stienkemeier¹, M. Mudrich¹, and T. Möller¹ — ¹Universität Freiburg — ²TU Berlin — ³Elettra-Sincrotrone Trieste — ⁴Tohoku University, Sendai — ⁵EPFL, Lausanne — ⁶Università di Milano — ⁷Kyoto University

The ionization dynamics of helium droplets resonantly excited by intense, XUV radiation has been investigated. Depending on the intensity, the excited atoms can decay by interatomic Coulombic decay (ICD) or form a network of excited atoms which then collectively autoionize leading to nanoplasma formation [1,2]. Recently, we have extended our studies to time resolve the processes using a pump-probe technique. Using a UV laser to deplete the excited states, we observe a signal loss in the ICD signal in the photoelectron spectrum for short time delays followed by its reappearance at longer time delays (> 1 ps).

[1] Y. Ovcharenko et al., Phys. Rev. Lett. 112, 073401 (2014)

[2] A. LaForge et al., Sci. Rep. 4, 3621 (2014)