Search results for "Static secondary-ion mass spectrometry"

showing 8 items of 8 documents

Measurement of nanoparticle mass distributions by laser desorption/ionization time-of-flight mass spectrometry.

2011

In this paper, access to the mass distribution analysis of nanoparticles is described based on laser desorption/ionization and time of flight mass spectrometry. Two examples are given, demonstrating the accurate mass distribution analysis of nanoparticles fabricated both ex situ and in situ during the laser-assisted desorption process. The potentials and the limitations of the method are discussed, with special emphasis on carbonaceous clusters and molecules.

Desorption electrospray ionizationStatic secondary-ion mass spectrometryMatrix-assisted laser desorption electrospray ionizationChemistryAnalytical chemistryGeneral Materials ScienceTime-of-flight mass spectrometryCondensed Matter PhysicsMass spectrometrySoft laser desorptionIon sourceAmbient ionizationJournal of physics. Condensed matter : an Institute of Physics journal
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Cluster calibration in mass spectrometry: laser desorption/ionization studies of atomic clusters and an application in precision mass spectrometry.

2003

For accurate mass measurements and identification of atomic and molecular species precise mass calibration is mandatory. Recent studies with laser desorption/ionization and time-of-flight analysis of cluster ion production by use of fullerene and gold targets demonstrate the generation of atomic clusters for calibration purposes. Atomic ion results from the Penning trap mass spectrometer ISOLTRAP, in which a carbon cluster ion source has recently been installed, are presented as an application in the field of precision mass spectrometry.

Static secondary-ion mass spectrometryChemistryAnalytical chemistryMass spectrometryBiochemistryISOLTRAPIon sourceAtomic massAnalytical ChemistrySecondary ion mass spectrometryPhysics::Atomic and Molecular ClustersPhysics::Atomic PhysicsTime-of-flight mass spectrometryAtomic physicsHybrid mass spectrometerAnalytical and bioanalytical chemistry
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Principle and analytical applications of resonance lonization mass spectrometry

1989

Resonance ionization mass spectrometry (RIMS) is a very sensitive analytical technique for the detection of trace elements. This method is based on the excitation and ionization of atoms with resonant laser light followed by mass analysis. It allows element and, in some cases, isotope selective ionization and is applicable to most of the elements of the periodic table. A high selectivity can be achieved by applying three step photoionization of the elements under investigation and an additional mass separation for an unambiguous isotope assignment. An effective facility for resonance ionization mass spectrometry consists of three dye lasers which are pumped by two copper vapor lasers and of…

Static secondary-ion mass spectrometryChemistryAnalytical chemistryPhotoionizationThermal ionization mass spectrometryMass spectrometryAnalytical ChemistryIonizationPhysics::Atomic and Molecular ClustersPhysics::Atomic PhysicsTime-of-flight mass spectrometryDirect electron ionization liquid chromatography–mass spectrometry interfaceAtomic physicsInductively coupled plasma mass spectrometryMikrochimica Acta
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A static SIMS study of superficial reactions (O2, (CN)2) on silver

1998

Abstract The exposure of silver surfaces to oxygen under about 10 −6 mbar at room temperature was studied mainly by secondary ion mass spectrometry (SIMS) used in a static mode. No reactivity of oxygen appeared under these exposure conditions in accordance with previous works. No modifications in the AES spectra, but an unexpected and huge increase in the intensities of secondary ions such as CN − , CNO − , Ag(CN) − 2 , Ag 2 CN + were observed. Different experiments were performed in order to specify the origin of this unexpected reaction in presence of pure oxygen. Moreover, exposures to pure (CN) 2 and to a mixture of cyanogen and oxygen were performed in order to compare the reactivity o…

Static secondary-ion mass spectrometryCyanogenCyanideInorganic chemistryAnalytical chemistrychemistry.chemical_elementSurfaces and InterfacesCondensed Matter PhysicsOxygenSurfaces Coatings and FilmsSecondary ion mass spectrometrychemistry.chemical_compoundAdsorptionchemistryMaterials ChemistryMoleculeReactivity (chemistry)Surface Science
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Laser desorption/ionization cluster studies for calibration in mass spectrometry

2003

Precise mass calibration is mandatory in many fields of mass spectrometry. We have performed laser desorption/ionization cluster studies with a MALDI-TOF mass spectrometer on gold and fullerene targets to produce atomic clusters. These investigations demonstrate that clusters are ideally suited for this purpose. Pulsed N 2 -laser and Nd:YAG-laser ablation was used to produce positively as well as negatively charged clusters. Earlier observations of dianionic metal clusters are confirmed. First results from the tandem Penning trap mass spectrometer ISOLTRAP using carbon clusters as mass references show how carbon clusters can be applied to precision mass spectrometry by providing absolute ma…

Static secondary-ion mass spectrometryMaterials scienceMass spectrometryISOLTRAPAtomic and Molecular Physics and OpticsAtomic massPhysics::Atomic and Molecular ClustersMass spectrumPhysics::Atomic PhysicsAtomic physicsTime-of-flight mass spectrometryNuclear ExperimentQuadrupole mass analyzerHybrid mass spectrometerThe European Physical Journal D - Atomic, Molecular and Optical Physics
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Comparative optical reflection and mass spectrometry analysis of thermodesorption of Langmuir-Blodgett films

1992

Abstract Thermodesorption of cadmium arachidate multilayers is studied by optical surface analysis and by mass spectrometry measurements. The optical reflection technique has been improved to discriminate signal contributions from desorption and light scattering. The scattering arises from film heterogeneities that are also observed by Nomarsky microscopy. The assessment of these heterogeneities is important to understand mass spectrometry data. Both the optical technique and mass spectrometry are sensitive to observing the multilayer phase transition at 110 °C and the desorption near 200 °C (at the heating rate applied). The mass spectrometry analysis yields detailed information on the des…

Static secondary-ion mass spectrometryScatteringChemistryMetals and AlloysAnalytical chemistrySurfaces and InterfacesThermal ionization mass spectrometryMass spectrometryLangmuir–Blodgett filmLight scatteringSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsDesorptionMicroscopyMaterials ChemistryThin Solid Films
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Study by static SIMS, XPS and UPS of the adsorption of cyanogen on (100) Ni surfaces

2000

Abstract The interaction of cyanogen with (100) Ni surfaces at room temperature was studied using secondary ion mass spectrometry in a static mode, and photoemission spectroscopies (XPS and UPS). It has been shown that cyanogen is adsorbed on this nickel surface in a dissociative mode: atomic carbon and nitrogen are present on the surface as well as CN fragments. These adsorbed species have been characterized by XPS and UPS. Increasing the temperature in the 400 K range increases the rate of the dissociation reaction of CN into atomic carbon and nitrogen. Moreover carbon is found to dissolved into the bulk for temperatures as low as 475 K. No evidence has been found of a polymerized form of…

inorganic chemicalsStatic secondary-ion mass spectrometryChemistryCyanogenAnalytical chemistrychemistry.chemical_elementSurfaces and InterfacesCondensed Matter PhysicsSurfaces Coatings and FilmsSecondary ion mass spectrometrychemistry.chemical_compoundNickelAdsorptionX-ray photoelectron spectroscopyChemisorptionMaterials ChemistryCarbonSurface Science
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Trace Analysis of Plutonium and Technetium by Resonance Ionization Mass Spectrometry Using an Atomic Beam and a Laser Ion Source

1990

A method for low level detection of plutonium and technetium is described with a detection limit of less than 107 atoms. Plutonium is a very toxic element due to its radioactive decay as well as its chemical behaviour. It was released to the environment in large amounts during the fifties and sixties of his century, principally by nuclear-weapon tests and some accidents. As a result about 0.4 − 4 mBq per gram 239Pu(T1/2 = 24390 y), corresponding to 4 × 108 − 4 × 109 atoms, can be found in the Northern Hemisphere in soil samples.

inorganic chemicalsStatic secondary-ion mass spectrometryMaterials scienceRadiochemistryAnalytical chemistryThermal ionizationchemistry.chemical_elementThermal ionization mass spectrometryMass spectrometryIon sourceAtmospheric-pressure laser ionizationPlutoniumchemistryDirect electron ionization liquid chromatography–mass spectrometry interface
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