Navegação Ciências Exatas e da Terra por Assunto "Feixes de íons"
Resultados 1-10 de 10
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Energy deposition of H and He ion beams in hydroxyapatite films : a study with implications for ion-beam cancer therapy
(2014) [Artigo de periódico]Ion-beam cancer therapy is a promising technique to treat deep-seated tumors; however, for an accurate treatment planning, the energy deposition by the ions must be well known both in soft and hard human tissues. Although ... -
Impact features induced by single fast ions of different charge-state on muscovite mica
(2021) [Artigo de periódico]The influence of the charge state q on surface modifications induced by the impact of individual fast, heavy ions on muscovite mica was investigated. Beams of 593 MeV 197Auq+ with well-defined initial charge states over a ... -
Ion beam analysis (IBA) and instrumental neutron activation analysis (INAA) for forensic characterisation of authentic Viagra® and of sildenafil-based illegal products
(2021) [Artigo de periódico]Illegal trafficking of pharmaceutical products by criminal organisations is a global threat for public health. Drugs for erectile dysfunction such as phosphodiesterase type 5 inhibitors are the most commonly counterfeited ... -
Ion-beam–plasma interaction effects on electrostatic solitary wave propagation in ultradense relativistic quantum plasmas
(2017) [Artigo de periódico]Understanding the transport properties of charged particle beams is important not only from a fundamental point of view but also due to its relevance in a variety of applications. A theoretical model is established in this ... -
Ion-beam/plasma modes in ultradense relativistic quantum plasmas : dispersion characteristics and beam-driven instability
(2017) [Artigo de periódico]A relativistic quantum-hydrodynamic plasma model is proposed, to model the propagation of electrostatic waves in an ultradense quantum electron-ion plasma in the presence of an ion beam. A dispersion relation is derived ... -
Simplified self-consistent model for emittance growth in charged beams with mismatched envelopes
(2007) [Artigo de periódico]This paper analyzes the envelope dynamics of magnetically focused, high-intensity charged particle beams. As known, mismatched envelopes decay into equilibrium with simultaneous emittance growth. To describe the emittance ... -
Superconducting properties and electron scattering mechanisms in a Nb film with a single weak-link excavated by focused ion beam
(2021) [Artigo de periódico]Granularity is one of the main features restricting the maximum current which a superconductor can carry without losses, persisting as an important research topic when applications are concerned. To directly observe its ... -
The potentialities of ultrasound as an alternative to chemical etching for proton beam writing micropatterning
(2022) [Artigo de periódico]In this paper, we explore the potentialities of using ultrasound waves as a post-irradiation treatment after proton beam writing (PBW) patterning of PTFE. To that end, 2-mm-thick foils of PTFE were irradiated with 2.2 MeV ... -
Unraveling energy loss processes of low energyheavy ions in 2D materials
(2019) [Artigo de periódico]Structuring of 2D materials and their heterostructures with ion beams is a challenging task, because typically low ion energies are needed to avoid damage to a substrate. In addition, at the very first monolayers of a ... -
Unraveling structural and compositional information in 3D FinFET electronic devices
(2019) [Artigo de periódico]Non-planar Fin Field Effect Transistors (FinFET) are already present in modern devices. The evolution from the well-established 2D planar technology to the design of 3D nanostructures rose new fabrication processes, but a ...