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The electronic spectrum of metallic finite-size single-wall carbon nanotubesat low energies is derived. It is based on a tight-binding description for theinteracting p_{z} electrons. Not only the forward scattering parts of theCoulomb interaction, which are diagonalized by bosonization, are considered,but also all other processes becoming relevant for small diameter tubes. As aconsequence of the substructure of the underlying lattice, a spin 1 triplet isfound as ground state if the exchange splitting is larger than the branchmismatch, a spin 0 singlet otherwise. Moreover the excitation spectrum iscalculated.

The low energy spectrum of finite size metallic SWNTs