Skip to Main Content
MOCVD-preparation of ordered  surfaces of InP and GaP was monitored in-situ with reflectance difference/anisotropy spectroscopy (RDS/RAS). RDS was measured at 20 K after contamination-free transfer of the sample to UHV. Specific RD spectra with the highest peaks and fine structure were correlated with different ordered surface reconstructions. The ordered In-rich InP surface was investigated with femtosecond 2PPE. Surface states and surface resonances near the Γ-point showed up as peaks in the 2PPE spectrum in agreement with theoretical predictions.