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A: Fachverband Atomphysik

A 15: Atomic clusters II (with MO)

A 15.8: Vortrag

Dienstag, 1. März 2016, 16:15–16:30, f107

Assigning cluster size and laser intensity specific features to single cluster ion spectra — •M. Müller¹, M. Sauppe¹, A. Ulmer¹, B. Langbehn¹, Y. Ovcharenko¹, L. Flückiger¹, S. Toleikis², H. Höppner², S. Stephan², T. Gorkhover¹, J.-P. Müller¹, D. Rupp¹, and T. Möller¹ — ¹TU Berlin, Hardenbergstr. 36, 10623 Berlin — ²DESY, Notkestr. 85, 22607, Hamburg

Intense laser-cluster interaction results in nanoplasma formation which is a topic of current interest. Due to the finite size of clusters and their availability in the gas phase, no energy can dissipate into surroundings. An inherent difficulty in the analysis of most experimental results of laser-cluster interaction has been the convolution of the cluster size distribution and focal density distribution. Single-shot-single-particle experiments avoid averaging over the two mentioned distributions and allows for uncovering a large variety of individual processes. We present results from an experiment at the Free-Electron Laser FLASH (Hamburg, Germany) with a strong NIR and XUV-FEL source available at the same time. The ion-time-of-flight (TOF) spectra from clusters induced by intense and short NIR laser pulses taken in the single-shot-single-particle mode exhibit features depending either mainly on the laser intensity or the cluster size. For the latter we will compare our results with the size distribution derived from the FEL induced diffraction patterns. These assignments will be relevant for all kinds of single cluster experiments using optical lasers.