Search results for "Cathode ray"

showing 10 items of 96 documents

Optical grating recording in ChG thin film by electron beam

2013

Abstract Recording capabilities of As Se S chalcogenide (ChG) glasses using electron beam (EB) lithography have been investigated in this study. After exposure with EB the thin films of these inorganic glasses can be etched in alkaline amine solvent with high selectivity. High resolution, smooth shaped structures have been fabricated using ChG thin films. Height of developed pattern can be controlled through changing applied electron dose.

Materials scienceChalcogenidebusiness.industryfungiHigh selectivityAmine solventfood and beveragesHigh resolutionCondensed Matter PhysicsElectronic Optical and Magnetic Materialschemistry.chemical_compoundOpticschemistryMaterials ChemistryCeramics and CompositesCathode raysense organsThin filmbusinessLithographyDiffraction gratingJournal of Non-Crystalline Solids
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Precision mass measurements using a penning trap and highly charged ions produced in an electron beam ion source

1997

A method for precision mass measurements in a Penning trap using highly charged ions produced in an electron beam ion source (CRYSIS) has been developed. The cyclotron frequencies for O8+, 7+, 6+, 5+ and Ar18+, 17+, 16+, 15+, 14+, 13+ ions have been determined by the excitation of the sum frequency v+ + v−. In addition to CRYSIS ions, H+, H2+ and He+ ions were produced by electron bombardment of the H2 rest gas or helium gas introduced through an UHV leak valve into an auxiliary ion trap (or a pre-trap). A technique for fast (seconds) interchanging of the ion species in the precision trap has been implemented to reduce the long term magnetic field drift.

Materials scienceCyclotronCondensed Matter PhysicsIon gunPenning trapAtomic and Molecular Physics and OpticsIon sourceIonlaw.inventionPhysics::Plasma PhysicslawCathode rayIon trapAtomic physicsMathematical PhysicsExcitationPhysica Scripta
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A high pressure gas target system for the determination of absolute electron scattering cross sections

1979

A high pressure gas target system is described, which is suitable for measurements of absolute electron scattering cross sections and for high resolution electron scattering experiments at medium energies. Details of design and construction are given and special investigations are discussed with respect to straggling effects that take place in the walls and in the gases, and to changes in the gas density, due to heating by the electron beam.

Materials scienceGas electron diffractionCathode rayHigh resolutionGeneral MedicineInelastic scatteringAtomic physicsElectron scatteringNuclear Instruments and Methods
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Editorial for the Special Issue on Nanofabrication with Focused Electron/Ion Beam Induced Processing

2021

Focused electron beam (FEB) and focused ion beam (FIB) technologies have opened novel paths for material science research and technology at the micro and nano scales in recent decades [...]

Materials scienceIon beamMechanical EngineeringNanotechnologyElectronFocused ion beamn/aEditorialNanolithographyScience researchControl and Systems EngineeringNano-TJ1-1570Cathode rayMechanical engineering and machineryElectrical and Electronic EngineeringMicromachines
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Mapping the 3D-surface strain field of patterned tensile stainless steels using atomic force microscopy.

2005

Abstract The quantification of microstructural strains at the surface of materials is of major importance for understanding the reactivity of solids. The present paper aims at demonstrating the potentialities of the atomic force microscopy (AFM) for mapping the three-dimensional surface strain field on patterned tensile specimens. Electron beam (e-beam) lithography has been used to deposit 16×16 arrays of gold-squared pads. Monitoring the evolution of such a pattern under applied strain allows to quantify the triaxial strains both at the micro-(plastic) domain and nanoscale (elastic) domain vs. applied strain. The proposed method was applied to stainless steels after 4.5% plastic strain.

Materials scienceNanostructureStrain (chemistry)PlasticityAtomic and Molecular Physics and OpticsElectronic Optical and Magnetic MaterialsCrystallographyUltimate tensile strengthMicroscopyCathode rayComposite materialInstrumentationNanoscopic scaleLithographyUltramicroscopy
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The Engineering of Hot Carbon Nanotubes with a Focused Electron Beam

2004

Single-wall and multiwall carbon nanotubes at high temperature are irradiated with the focused electron beam in an electron microscope. Nanotubes can be tailored with monolayer precision, and new morphologies of nanotubes are created. Atoms from layers of multiwall tubes can be removed and the tubes can be bent by a predefined angle. Bundles of single-wall tubes are transformed locally to multiwall tubes with coherent transition between the two modifications.

Materials sciencePhysics::Instrumentation and DetectorsMechanical EngineeringNanostructured materialsBent molecular geometryBioengineeringMechanical properties of carbon nanotubesGeneral ChemistryCarbon nanotubeCondensed Matter::Mesoscopic Systems and Quantum Hall EffectCondensed Matter Physicslaw.inventionCondensed Matter::Materials SciencelawMonolayerCathode rayGeneral Materials ScienceIrradiationElectron microscopeComposite materialComputer Science::DatabasesNano Letters
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Numerical Simulations of Nanogel Synthesis Using Pulsed Electron Beam

2019

In this work, a new method for numerical simulation of the radiation chemistry of aqueous polymer solutions exposed to a sequence of electron pulses is presented. The numerical simulations are based on a deterministic approach encompassing the conventional homogeneous radiation chemistry of water as well as the chemistry of polymer radicals. The multitude of possible reactions in the macromolecular system is handled by allowing for a large number of macromolecular species. The speciation of macromolecular species is done to account for variations in molecular weight, number of alkyl radicals per chain, number of peroxyl radicals per chain, number of oxyl radicals per chain, and number of in…

Materials sciencePolymers and Plasticskineticmacroradical02 engineering and technologyElectronRadiation chemistryRadiation010402 general chemistry01 natural sciencesMolecular physicsInorganic ChemistryMaterials Chemistrychemistry.chemical_classificationAqueous solutionComputer simulationOrganic ChemistryPolymer021001 nanoscience & nanotechnologyCondensed Matter Physics0104 chemical sciencesradiationCondensed Matter::Soft Condensed MatterchemistrynanogelCathode raysimulations0210 nano-technologyNanogelMacromolecular Theory and Simulations
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Shape restoration effect in Ag-SiO2 core-shell nanowires.

2014

The combination of two different materials in a single composite core–shell heterostructure can lead to improved or even completely novel properties. In this work we demonstrate the enhancement of the mechanical properties of silver (Ag) nanowires (NW) achieved by coating them with a silica (SiO2) shell. In situ scanning electron microscope (SEM) nanomechanical tests of Ag–SiO2 core–shell nanowires reveal an improved fracture resistance and an electron-beam induced shape restoration effect. In addition, control experiments are conducted separately on uncoated Ag NWs and on empty SiO2 shells in order to gain deeper insight into the peculiar properties of Ag–SiO2. Test conditions are simulate…

Materials scienceScanning electron microscopeMechanical EngineeringComposite numberNanowireShell (structure)BioengineeringHeterojunctionNanotechnologyGeneral Chemistryengineering.materialCondensed Matter PhysicsCoatingCathode rayengineeringFracture (geology)General Materials ScienceComposite materialNano letters
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Luminescence of ferroelectric crystals: LiNbO3and KNbO3

2000

Abstract The thermostimulated luminescence and time-resolved luminescence of LiNbO3 (congruent, stoichiometric, Eu−, Mn−, or Cr−doped) and KNbO3 crystals (undoped, Fe−, or Mn− doped) excited by X-ray, pulsed nitrogen laser or pulsed electron beam were studied. The luminescence decay times of niobium-oxygen groups (regular or perturbed by defect or impurity) were obtained. It is shown that the energy transfer from bulk to the activator in LiNbO3 is not effective during the electron-hole recombination process.

Materials sciencebusiness.industryDopingPhysics::OpticsCondensed Matter PhysicsMolecular physicsElectronic Optical and Magnetic MaterialsCondensed Matter::Materials ScienceImpurityCondensed Matter::SuperconductivityExcited stateActivator (phosphor)Physics::Atomic and Molecular ClustersCathode rayOptoelectronicsCondensed Matter::Strongly Correlated ElectronsNitrogen laserbusinessLuminescenceStoichiometryFerroelectrics
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Some Advantages of the Gyrotrons with Width Emitters

2020

The main trends in gyrotron development are escalation of the radiated power and increasing the frequency of coherent radiation. For both trends it is beneficial to develop gyrotrons with wide emitters because this allows one to use cryomagnets with smaller inner bore sizes. For analyzing and optimizing the operation of gyrotrons with wide emitters it is proposed to represent such emitters as a superposition of thin rings and analyze the properties of electron beams emitted by each of these rings. The analysis of electron beam properties, for electron optical systems with different emitters is presented. The possibility to reduce velocity spread by anode profiling is discussed. The dynamics…

Materials sciencebusiness.industryElectronEffective radiated powerlaw.inventionAnodeSuperposition principleOpticsPhysics::Plasma PhysicslawGyrotronElectron opticsCathode rayPhysics::Accelerator PhysicsStimulated emissionbusiness2020 IEEE 21st International Conference on Vacuum Electronics (IVEC)
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