Raman spectra in the region of the pentagonal pinch mode Ag(2) of C60 were taken in situ during the deposition of C60 on the GaAs(100) surface at different temperatures. For very low coverages, only the feature corresponding to the pentagonal pinch mode of pristine C60 is visible. The onset of polymerization under laser irradiation occurred at thicknesses of about 15 nm which is attributed to a suppressive effect on the polymerization process due to the interaction of C60 with the substrate surface. The line shape for the feature due to photopolymerized C60 was different at each temperature indicating distinct polymeric states at different temperatures. These different states are discussed in comparison to recent theoretical calculations. Additionally, the photopolymerization due to irradiation after growth was investigated in situ.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)