Technique for profiling 1H with 2.5-MeV Van de Graaff accelerators

Doyle, B.L.; Peercy, P. S.

doi:10.1063/1.90654

Cited by 273 publications

(43 citation statements)

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“…The molecular weight and composition of these random copolymers were measured by gel permeation chromatography (GPC) and forward recoil spectrometry (FRES). 16,17 For f > 0.5, the random copolymer is dPS-rich, and for f < 0.5, the random copolymer is PVP-rich. It should be noted that f denotes the average styrene fraction in a random copolymer chain.…”

Section: Methodsmentioning

confidence: 99%

“…The styrene unit in the copolymer was deuterated in order to allow for its use as a label in the subsequent FRES experiments. 16,17 The FRES technique utilizes a 4 He ion beam impinging on an area ∼5 mm × 1 mm of each fracture surface of the sample. The energy of recoiled hydrogen and deuterium particles is recorded and converted into a depth scale based on the energy loss of the particles on their path through the sample.…”

Section: Methodsmentioning

confidence: 99%

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Effect of the Monomer Ratio on the Strengthening of Polymer Phase Boundaries by Random Copolymers

et al. 1997

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Effect of the Monomer Ratio on the Strengthening of Polymer Phase Boundaries by Random Copolymers

et al. 1997

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“…Esto solo se consigue si éstos, los áto-mos que queremos detectar, son más ligeros que el haz. Esta técnica se ha usado con éxito para obtener perfiles de concentración de H con haces de He (19). Según lo expuesto, es claro que RBS y ERD son dos técnicas analíticas complementarias.…”

Section: Colisiones Elásticasunclassified

Análisis de materiales con haces de iones generados por un acelerador electrostático

Font¹

2000

Bol. Soc. Esp. Ceram. Vidr.

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Análisis de materiales con haces de iones generados por un acelerador electrostáticoA. CLIMENt fONt Dpto. Física Aplicada C-xII, Universidad Autónoma Madrid Cantoblanco, E-28049 Madrid.Un acelerador electrostático es una herramienta muy versátil para analizar materiales mediante las técnicas de haces de iones. Estas técnicas, conocidas como técnicas IBA (ion beam analysis), son ampliamente utilizadas para la caracterización cuantitativa y no destructiva de la estructura y la composición de la zona próxima a la superficie de cualquier material, hasta profundidades de 10 μm y con resolución superficial de 2 a 20 nm. Sus aplicaciones abarcan muchos campos, entre los que destacan: ciencia de materiales, microelectrónica, metalurgia, mineralogía, estudios medioambientales, ciencias biomédicas, arte y arqueología, etc. En este trabajo se revisan los principios físicos de las técnicas IBA y algunas de sus capacidades analíticas se ilustran con una selección de ejemplos. Palabras clave: Análisis con haces de iones, caracterización de materiales, RBS, ERDA, PIXE. Materials analysis by ion beam generated from electrostatic accelerator.An electrostatic accelerator is a very versatile tool for the analysis of the materials elemental composition by means of ion beam based analytical techniques. These techniques known as IBA (ion beam analysis) are widely used as a quantitative and non destructive characterization of almost any material down to depth of 10 μm below the surface and with a surface resolution from 2 to 20 nm. Their applications cover a wide range of areas such as: materials science, microelectronics, environmental studies, biomedical sciences, art and archaeology, etc. In this work the general physical principles of IBA are reviewed and its capabilities are illustrated with a selection of examples.

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“…For a first estimate of the required intensity of the desorption laser we have performed elastic recoil detection analysis (ERDA) investigations [23] to characterize the composition of the surface contamination of different metal foils. These measurements were carried out at GSI Helmholtzzentrum für Schwerionenforschung GmbH and at the University of the Germany Federal Armed Forces in Munich.…”

Section: A Target Materials Composition and Simulationmentioning

confidence: 99%

Influence of fs-laser desorption on target normal sheath accelerated ions

Hoffmeister

Bellei

Harres

et al. 2013

Phys. Rev. ST Accel. Beams

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We report on the effects of fs-laser desorption on the ion acceleration induced by the target normal sheath acceleration (TNSA) mechanism. The experiment was performed at the Lawrence Livermore National Laboratory (LLNL) using the 100 TW Callisto laser of the Jupiter Laser Facility (JLF). Thin metal foils (Au, Cu, and Al) with thicknesses ranging from 10 to 20 m were irradiated by a variable number of low intensity ($ 10 12 W=cm 2 ) laser pulses, the last one arriving 100 ms before the main pulse. With these short pulses water vapor and hydrocarbon contaminations could stepwise be removed from the target surface. Substantial modifications of the TNSA-ion energy spectra were observed such as diminished proton energy and intensity, the absence of low-charged ion states, increased particle numbers for C 4þ and O 6þ ions in the higher energetic part of their particle spectra as well as the acceleration of target ions. The controlled application of fs-laser desorption on the laser-ion acceleration thus strongly influences the ion spectra and offers the possibility of selecting a targeted range of ion species for the acceleration to higher energies due to the systematic removal of contamination layers.

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Technique for profiling 1H with 2.5-MeV Van de Graaff accelerators

Cited by 273 publications

References 5 publications

Effect of the Monomer Ratio on the Strengthening of Polymer Phase Boundaries by Random Copolymers

Effect of the Monomer Ratio on the Strengthening of Polymer Phase Boundaries by Random Copolymers

Análisis de materiales con haces de iones generados por un acelerador electrostático

Influence of fs-laser desorption on target normal sheath accelerated ions

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