SKM 2023 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 13: Focus Session: Ion Beam Interaction with Surfaces and 2D Materials II

O 13.8: Vortrag

Montag, 27. März 2023, 17:00–17:15, GER 38

Generation of pulsed ions using ultrafast electrons — Marius Constantin Chirita Mihaila, Gabriel Lukas Szabo, Alexander Sagar Grossek, and •Richard Arthur Wilhelm — TU Wien, Institute of Applied Physics, 1040 Vienna, Austria

Ultrafast physics is a very active research field where high temporal and spatial resolution provides unprecedented structural information in material science.

Here, we describe the development of a new technique that allows the creation of pulsed ions using ultrafast electrons. The general technique of using picosecond ion pulses to study novel time-resolved processes in materials will be hugely impactful and aims at investigating ultrafast phenomena that are intractable with pump-probe measurements using pulsed electrons and lasers. However, the use of pulsed ions has been limited by the complexity of achieving short pulse lengths at the sample plane.

The experimental setup features a Ti: Sapphire laser that triggers femtosecond electron pulses from a low-workfunction cathode. The pulsed electrons then propagate through a miniaturized ion source and generate pulsed ions. Current challenges of preserving a short ion pulse length upon transport to the sample plane and prospects of pump-probe measurements with ultrafast ions are discussed.