Abstract
When a discrete electronic level interferes with a broad continuum of states a Fano resonance phenomenon occurs giving rise to characteristically asymmetric peaks in excitation spectra. Here we report on recent observations of such spectroscopic signatures in: (i) normal emission ultraviolet photoelectron spectra (UPS) of Cu impurities embedded in noble gas-monolayers on highly oriented pyrolytic graphite (HOPG), and in (ii) low-temperature scanning tunneling spectra (STS) of individual Ce adatoms and of small Ce clusters on Ag(111). These findings provide a new and promising avenue for the detection and characterization of magnetic and non-magnetic impurities and small clusters at surfaces. Furthermore, (iii) a short account is given on new developments towards photoemission at atomic-scale resolution using the tip of a scanning tunneling microscope (STM) as local electron analyzer.
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 call
