6533b7d2fe1ef96bd125ea26
RESEARCH PRODUCT
Coexisting electron emission mechanisms in small metal particles observed in fs-laser excited PEEM
Andrei GloskovskiiBaerbel RethfeldGerd SchönhenseD. ValdaitsevSergej A. Nepijkosubject
Range (particle radiation)ChemistryFermi levelSurfaces and InterfacesElectronCondensed Matter PhysicsLaserSurfaces Coatings and Filmslaw.inventionsymbols.namesakelawExcited stateMaterials ChemistrysymbolsCluster (physics)Laser power scalingAtomic physicsExcitationdescription
Abstract Silver cluster films deposited on Si(1 1 1) were investigated by spectroscopic photoelectron microscopy using fs-laser excitation tuneable between hν = 1.45–1.65 eV and 2.9–3.3 eV. With increasing coverage the films grown as stepped wedges first exhibit clusters of few nanometers diameter with narrow size distributions that later agglomerate forming larger islands up to about 100 nm diameter. The cluster films have been characterized by SEM, AFM and HR-TEM. In the 3.1 eV range the small clusters emit more effectively and the dependence of electron yield on laser power follows a quadratic power law. Microspectroscopy reveals that the Fermi level onset is sharp(
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2007-10-01 | Surface Science |