Search results for "Lanthanum hexaboride"

showing 3 items of 3 documents

UV LED Photo Electron Ionisation for MS and IMS

2009

AbstractA new MEMS ionisation source for spectrometry is presented on the basis of photo electron emission in silicon MEMS. Lanthanum hexaboride ceramic sample and thin nanolayer proved their suitability for photo electron emission in the desired photon energy range of 3.1eV to 3.9eV which correspond to industrially available UV LED. This ionisation source alternative to a Photoionisationdetector (PID) is inspected of its gas ionisation behaviour using gases with an ionisation potential over and under an energy of 10,6eV. To enable the ionisation of the gases the emitted electrons were accelerated to a well-defined energy. The results of these investigations are comparable to the UV dischar…

Range (particle radiation)Gas-discharge lampSiliconChemistry(all)Analytical chemistrychemistry.chemical_elementGeneral MedicineElectronLanthanum hexaboridePhoton energyMass spectrometrylaw.inventionlanthanum hexaboridechemistry.chemical_compoundchemistrylawIonizationChemical Engineering(all)photoemissionProcedia Chemistry
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Nano photoelectron ioniser chip using LaB6 for ambient pressure trace gas detection

2012

A detector including a nanoscaled ioniser chip that surmounts the limitation of conventional photo ionisation detectors is presented. Here, ionisable gaseous substances can be detected by photoelectrons accelerated to the ionisation potential of the incoming gaseous molecules. Thin lanthanum hexaboride (LaB"6) films deposited by pulsed laser technique (PLD) serve as the air stable photocathode material representing the basis of the ioniser chip of the detector. Besides the analysis of the emission behaviour of the photocathode in vacuum and at atmospheric pressure, the detection of different volatile alcohols using the detector with a low-energy UV LED instead of a PID (VUV photon source) w…

Atmospheric pressurebusiness.industryDetectorAnalytical chemistryLanthanum hexaboridePhotoelectric effectCondensed Matter PhysicsAtomic and Molecular Physics and OpticsPhotocathodeSurfaces Coatings and FilmsElectronic Optical and Magnetic Materialschemistry.chemical_compoundchemistryNano-OptoelectronicsWork functionElectrical and Electronic EngineeringbusinessAmbient pressureMicroelectronic Engineering
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Low vacuum photo electron emitting thin films

2009

Impact ionisation is a standard procedure to ionise gaseous or vaporisable substances in organic mass spectrometry. In this work, a "softer" ionisation is introduced which seems to be an alternative ion source for reducing collision between substance molecules and the hot internal walls of the box. Through collision mainly found in impact ionisation sources, fragments are built especially from thermally sensitive substances falsifying the spectra. We present here photoelectron emitting materials for the soft ionisation using semiconducting compounds, galliumn nitride (GaN), and a representative of the borides, lanthanum hexaboride (LaB 6 ). They are evaluated by photoelectron spectroscopic …

Analytical chemistryGallium nitrideSurfaces and InterfacesElectronLanthanum hexaborideNitrideCondensed Matter PhysicsMass spectrometryIon sourceSurfaces Coatings and FilmsElectronic Optical and Magnetic Materialschemistry.chemical_compoundchemistryIonizationMaterials ChemistryElectrical and Electronic EngineeringThin filmphysica status solidi (a)
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