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1/2 images 1 of 2 images or videos When ions penetrate a material, highly complex processes take place - so fast that they could hardly be analyzed until now. But sophisticated measurements have now made it possible. How do different materials react to the impact of ions? This is a question that plays an important role in many areas of research - for example in nuclear fusion research, when the walls of the fusion reactor are bombarded by high-energy ions, but also in semiconductor technology, when semiconductors are bombarded with ion beams to produce tiny structures. The result of an ion impact on a material is easy to study retrospectively. However, it is difficult to understand the temporal sequence of such processes. A research group at TU Wien has now succeeded in analyzing on a time scale of one femtosecond what happens to the individual particles involved when an ion penetrates materials such as graphene or molybdenum disulphide. A careful analysis of the electrons that are emitted in the process was crucial: They can be used to reconstruct the temporal sequence of the processes - in a way, the measurement becomes an "electron slow-motion".
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