High resolution X‐ray absorption on metallicity selected C 60 peapods, single‐, and double walled carbon nanotubes

We have investigated the C1s core level X‐ray absorption of bulk samples of C 60 ‐peapods and double wall carbon nanotubes (DWNTs) derived from either metallic or semiconducting single‐walled carbon nanotubes (SWNTs). The clear cut separation of the different species unveils their distinct electronic van Hove singularities (VHS). The core level spectra of peapods are a quantitative superpositon of the conduction band of nanotubes and unoccupied molecular orbitals of C 60 . The outer shell metallicity selected DWNTs reveal changes in the π* resonance due to the inner shell VHS.