2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/100497Intrinsic optical transition energies for isolated and individual single wall carbon nanotubes grown over trenches are measured using tunable resonant Raman scattering. Previously measured E22_S optical transitions from nanotubes in surfactants are blue shifted 70-90 meV with respect to our measurements of nanotubes in air. This large shift in the exciton energy is attributed to a larger change of the exciton binding energy than the band-gap renormalization as the surrounding dielectric constant increases.Due to a mistake, a different paper was submitted as "revised v2". This is a re-submission of the origional version in order to correct the mistakeMaterials ScienceMesoscale and Nanoscale Physicstext