Selective amplification of the 37 and 63 cm -1 modes does not modify the depletion magnitude, suggesting that they are spectator modes to exciton transport in pentacene. There is no statistical difference in the depletion magnitude for these two pulse schemes relative to the single pulse at either offset photoexcitation location (Fig. , green and yellow). This indicates that there is no change in the overall excited state population with photoexcitation along the fast and slow transport axes. While previous results indicate that a phonon mode near 37 cm -1 , corresponding to a sliding motion along the crystallographic c axis, drives singlet fission, our results suggest that this mode does not play a role in exciton transport. At the fully overlapped region, the 5-100 ps averaged depletion for both 37 and 63 cm -1 pulse schemes are statistically significant from the single pulse. However, we also average the depletion across smaller time windows to identify overall trends in the dynamics. For the 37 cm -1 double pulse, no time window average is statistically significant from the single pulse (Table ), and the significance only appears in the long time window average between 5-100 ps (Table ). For the 63 cm -1 pulse, there is only statistical significance in the 10-20 ps time window average (Table ). Because the differences relative to the single pulse at the fully overlapped region are not consistent over the duration of the experiment, we determine that the dynamics with amplification of the 37 and 63 cm -1 modes are not physically different than the single pulse data at the fully overlapped position. Based on these data, we conclude that these two modes do not play a role in exciton transport.