Abstract
We have measured the valence-band photoemission and inverse photoemission spectra of single-walled carbon nanotubes (SWNTs) with mean radii of 0.7 and encapsulating fullerenes (peas), so-called “peapods.” The photoemission spectrum of the peas in the SWNTs is obtained by subtracting the spectrum of empty SWNTs from the spectrum of the peapod. The structures in the pea spectra correspond well to those in the spectrum of a face-centered-cubic solid. No structure is observed at binding energies ranging from the Fermi level to the onset of the highest occupied molecular orbital (HOMO) peak; the level of the peas inside the SWNT stays above .
- Received 11 September 2005
DOI:https://doi.org/10.1103/PhysRevB.73.075406
©2006 American Physical Society