Figure 3.

TA spectroscopy of ATPE-sorted LV950 SWCNTs pumped at 748 nm (i.e., in the SQ absorption band). (a) Peak transient absorption spectra at early times (solid traces) and steady-state absorption spectra (dashed traces) of DCM-filled (black traces) and SQ-filled (red traces) SWCNTs. Dashed vertical lines indicate the probe wavelengths at which the kinetic slices in panel b, that is, 748 nm (also the pump wavelength) and in panel c, that is, 1511 nm were obtained. (b) Kinetic slices for the SQ ground state bleach at 748 nm (blue trace), with the corresponding biexponential fit (black trace). The kinetic traces for free SQ dye in toluene (green trace) and the instrument response function, IRF (gray trace), are shown for reference. A probe-wavelength-dependent TA map is presented in Figure 4. (c) Kinetic slices at the peak (1511 nm) of the NIR ground state bleach dominated by the (10,8) S₁₁ transition for the SQ@LV950-ATPE (red trace) and reference DCM@LV950-ATPE (black trace). The kinetic trace for the IRF (gray trace) is shown for reference. Inset: Non-normalized kinetics with same color scheme as main panel.