Abstract
We have examined electron photoemission spectra and scanning tunnelling microscopy images from rough (coldly deposited) and smooth (annealed) Ag films. Photoemission is induced by 1-photon and 2-photon processes under conditions of common total photon energy, polarization and light penetration depth. For smooth films we show that photoemission involves direct optical transitions and that the 2-photon excitation is a simultaneous absorption rather than a 2-step process. On rough films the 2-photon process is mediated by the excitation of localized surface plasmon modes, it is strongly enhanced, and it involves indirect, momentum non-conserving transitions. One-photon excitation on rough films is not induced by localized surface plasmons since the frequency of the light falls outside their resonance band. Low temperature scanning tunnelling microscope images of rough films directly show the roughness features on which localized surface plasmon activity is centred.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Journal of Electron Spectroscopy and Related Phenomena
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
