Conveners
Posters: & Pizza
- Frieder Koch (GSI Helmholtzzentrum für Schwerionenforschung)
Ion bombardment is a powerful tool for tailoring the properties of materials, inducing structural modifications and enabling nanoscale analysis. However, understanding the fundamental response of matter to ion impact requires access to ultrafast processes that unfold on timescales ranging from femtoseconds to picoseconds. Although laser-based pump–probe techniques have long provided insight...
Ion impacts trigger atomic-scale processes in solids on ultrafast timescales, yet direct experimental access to these dynamics has been limited by the lack of short, monoenergetic ion pulses. To address these challenges, we developed a novel ion source based on strong-field photoionization of a cooled gas jet. In combination with a compact buncher system, we are able of generating...
As an air-stable Van der Waals magnetic semiconductor, CrSBr is receiving great research attention due to its exceptional optical, electronic, and magnetic properties. Below the Néel temperature of 132 K, CrSBr exhibits a typical A-type antiferromagnetic order comprised of antiferromagnetically coupled ferromagnetic monolayer. This special structure makes it susceptible to external stimuli,...
The controlled transport of ions through nanoconfined spaces has emerged as a crucial field with applications ranging from sensing to energy storage. Ion-track technology uses swift heavy ion irradiation to create tracks within the materials, and chemical etching to produce well-defined nanochannels with precisely tunable dimensions and geometries [1]. This attribute makes the channels...
The design of the Paris-Edinburgh Press (PEP) and large-volume diamond-anvil chambers (DAC) are designed to facilitate in-situ spectroscopic and optical measurements (e.g. Raman spectroscopy, optical observation) under high pressure and high temperature conditions, reaching up to 12 GPa and 1000 K. These setups accommodate sample sizes of 1x3mm. This setup is positioned on a motorized platform...
This work presents the synthesis and functional characterization of three-dimensional (3D) Au and Au–Ag alloy nanowire networks fabricated using ion-track nanotechnology. This approach allows precise control over nanowire diameter (40–200 nm), alloy composition (10–90% Ag), and network porosity (20-98%). Selective removal of Ag atoms yields hierarchical porous nanowires with tunable ligament...
This work presents detailed calculations of the Hamiltonian describing the combined magnetic dipole and non-axially symmetric electric quadrupole interactions. The resulting eigenvalues and eigenvectors are incorporated into the perturbation factor G22(t) for a polycrystalline sample, as defined by time-differential perturbed angular correlation (TDPAC) theory. G22(t) spectra for the combined...
Swift heavy ions (SHIs) are high-mass ions with high kinetic energies in the MeV–GeV range produced by large accelerator facilities. Upon traversing a material, SHIs induce various physical and chemical effects within the material, including extended defects, phase transitions, amorphization, or chemical reactions. The combination of high pressure and heavy ions is anticipated to induce...
Swift heavy ion irradiation is a powerful tool in materials research, particularly in terms of materials modification and engineering. In combination with chemical track etching and electrochemical deposition, swift heavy ion beams can be employed to synthesize high aspect ratio nanowires. This approach enables systematic investigations of size-dependent properties of nanowires, due to...
At the nanoscale metals exhibit catalytic properties that differ from those in the bulk phase. Gold, which is commonly regarded as inert, becomes a powerful catalyst for reactions such as the water gas shift reaction, which is an important step in the production of hydrogen. The catalytic activity depends on the size and shape of the metallic nanoparticle.
We explore the shaping of...
Recently, we applied evolutionary optimization, namely differential evolution, to fit Rutherford backscattering spectra [1]. We derived an algorithm that is capable of finding, with very high precision, the sample composition profile that best fits the experimental spectra in an autonomous manner. The robust nature of the differential evolution algorithm, especially with respect to the rather...
Due to growing technological and scientific interest in radiation effects on various nanomaterials, this work studies the impact of heavy ions on bismuth nanowires (NWs) using molecular dynamics simulations (MD) with “thermal spike” approximation to emulate the high-temperature zone generated by electronic excitation along the ion track. The diameter of the bismuth nanowires was...
Group-IV superconducting semiconductors present promising opportunities on the development of scalable hybrid platforms for quantum devices. However, achieving superconducting states in semiconductors remains challenging, particularly concerning the origin of coherent coupling and the relationship between carrier concentration and critical temperature. In this study, ion implantation and...
The influence of swift heavy ion radiation on nanostructures has attracted increasing interest in recent years. To systematically explore size-effects on the interaction of swift heavy ions with nanowires, we have synthesized Bi nanowires with tailored diameter between 20 and 400 nm by electrodeposition in etched ion track membranes. These nanowires were irradiated at the GSI linear...
The General Low Mass (GLM) beamline of ISOLDE is dedicated to collecting and handling radioactive isotopes.
The currently still used ion implantation chamber is a single vacuum chamber equipped with a turbo pump capable of reaching 1E-5 mbar, often relying on the beamline vacuum pump to achieve its optimal pressure of 1E-6 mbar.
The new ion implantation chamber features a load-lock...
