Measurements of the Population Lifetime of D Band and G′ Band Phonons in Single-Walled Carbon Nanotubes

We report time-resolved incoherent anti-Stokes Raman
scattering
measurements of the dynamics of the D and G′ bands in single-walled
carbon nanotubes at excitation energies of 1.51 and 1.63 eV over the
temperature range 4–330 K. The measurements indicate that the
population lifetimes (∼1 ps) of the phonons responsible for
the D band are dependent on nanotube type. The temperature dependencies
are consistent with anharmonic decay of the phonons into one low (<190
cm–1) and one high energy phonon.