Abstract
We present calculations of the breathing mode phonon frequencies of $^{4}\mathrm{He}$ and ${\mathrm{H}}_{2}$ physically adsorbed on the outside surface of one or more carbon nanotubes. Two geometries are considered. The first is a single, isolated nanotube, upon which the gas is adsorbed as a commensurate phase. The second is a quasi-one-dimensional ``groove'' phase nestled between two nanotubes. While the computed breathing mode frequencies depend on nanotube radius and the adsorbate, in general, they are of the same order of magnitude as those of the bare nanotubes.
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