Raman resonance profile of an individual confined long linear carbon chain

This paper reports tip-enhanced, polarization dependent and excitation energy dependent Raman measurements of an individual long linear carbon chain confined in a double-walled carbon nanotube. We determine the band gap of the chain (2.093 eV) from a Raman resonance profile with a line width Gamma = 145 meV, which corresponds to a lifetime of tau = 4.5 fs for the excited state of the chain. In the absence of external perturbations, this suggests that the chain's excited state dynamics depend on the confinement inside the nanotube and therefore on the chirality of the encasing carbon nanotube. (C) 2018 Elsevier Ltd. All rights reserved.