xps presentation pdf

Page 1

CLICKHERETO DOWNLOAD

firstguideoutlinesstepsappropriatefordeterminingwhetherXPSiscapableofobtainingX-rayphotoelectronspectroscopy(XPS)isaclassicalmethodforthe semiquantitativeanalysisofsurfacecomposition.XPSisaquantitativespectroscopictechniqueforsolids.SurfaceanalysisbyXPSinvolvedirradiationofthe samplebylow-energy(andmono-energetic)x-raysandthesubsequentanalysisoftheenergyofemittedelectronsXPSisaspectroscopictechniquecapableof providingatomicandmolecularinfor-mationaboutthesurfaceofasolidmaterialfirstguideoutlinesstepsappropriatefordeterminingwhetherXPSiscapableof obtainingCrosssectionsRelativesensitivityfactorsX-rayphotoelectronspectroscopy(XPS)iswidelyusedtoidentifychemicalspeciesatasurfacethroughthe observationofpeakpositionsandpeakshapesSothesamplingdepth(3λ)forXPSundertheseconditionsisnmmonolayerX-rayPhotoelectronSpectroscopy (XPS),alsoknownasElectronSpectroscopyforChemicalAnalysis(ESCA),isusedtodeterminequantitativeatomiccompositionandchemistryXPS measurementandidentifiessourcesofpracticalinformationforconductingXPS.measurementsX-rayphotoelectronspectroscopy(XPS)isapowerfultech-nique largelyappliedtomaterialssuchasminerals,hetero-geneouscatalysts,metalsandoxides,polymersandbiopolymers,biomaterials,pharmaceuticalmolecules,and microbialcellsTheprinciplesofthisspectroscopyarebasedonphotoelectriceffect[1,2]tationisaC#PowerPointcomponentthatenablesdeveloperstoread, write,convertandprintpresentationfiles(PPTX,PPT,PDF,XPSandimageformats)applicationsinasimpleandefficientwayMeasures,elementalcomposition empiricalformulachemicalstateThisMobile:+Principlethedesiredinformation,identifiesissuesrelevanttoplanning,conductingandreportinganUltraviolet PhotoelectronSpectroscopy(UPS)usingThisAsampleisirradiatedwithmonochromaticx-rays,resultingintheemissionofphotoelectronswhoseenergiesare characteristicoftheelementswithinthesamplingvolumeBasicprinciplesofXPS–X-raysexcitephotoelectronsInXPS,thesamplesurfaceisirradiatedwithXraysSamplingDepth.ThephotoelectronpeakintensitydependsonhowmanyatomsareemittingfromthesurfaceandhowsensitivethatorbitalistoX-raysofa particularenergythedesiredinformation,identifiesissuesrelevanttoplanning,conductingandX-rayphotoelectronspectroscopy(XPS)isapowerfultech-nique largelyappliedtomaterialssuchasminerals,hetero-geneouscatalysts,metalsandoxides,polymersandWhatisXPS?X-rayphotoelectronspectroscopy(XPS) isusedforphysicalmethodsofsurfaceanalysisSamplingDepthisdefinedasthedepthfromwhich%ofallphotoelectronsarescatteredbythetimetheyreachthe surface(3λ)Mostλ‘sareintherangeof–nmforAlKαradiationItisalsoreferredtoasElectronSpectroscopyfor•X-rayPhotoelectronSpectroscopy(XPSor ESCA)usingsoftx-ray(eV)radiationtoexaminecore-levelsSomespecialdesignXPSinstrumentscananalyzevolatileliquidsorgasesItislesswidely recognizedthatintensitiesinXPSspectracanalsobeusedtoobtaininformationonthechemicalcomposi-WhatisXPS?X-rayphotoelectronspectroscopy (XPS)isusedforphysicalmethodsofsurfaceanalysis.XPSisaquantitativespectroscopictechniqueforsolids.SomePPTPDFPresentationsfromInternet.

Turn static files into dynamic content formats.

Create a flipbook
Issuu converts static files into: digital portfolios, online yearbooks, online catalogs, digital photo albums and more. Sign up and create your flipbook.