Abstract
The confinement of a molecule encapsulated in a cylindrical nanotube depends on the tube radius. In small tubes with radius , a fivefold axis of the molecule coincides with the tube axis. The interaction between molecules in the nanotube is then described by a -rotor model on a 1D liquid chain with coupling between orientational and displacive correlations. This coupling leads to chain contraction. The structure factor of the 1D liquid is derived. In tubes with a larger radius the molecular centers of mass are displaced off the tube axis. The distinction of two groups of peapods with on- and off-axis molecules suggests an explanation of the apparent splitting of modes of in nanotubes measured by resonant Raman scattering.
- Received 1 June 2005
DOI:https://doi.org/10.1103/PhysRevLett.95.185506
©2005 American Physical Society