Our work demonstrates that the 161/176 cm -1 modes drive an increase in overall depletion magnitude for every photoexcitation location (Fig ). This difference is statistically significant at all locations in the first 10 ps (Table ), where the ground state depletion increases by 13-36%. While the statistical significance is not consistent after 10 ps, we note that there is an increase in population at all locations across all time windows (Fig. ) and the 176 cm -1 double pulse sees a statistically significant increase in depletion at the fully overlapped region for all but one time window (Table ). These data indicate that the 161/176 cm -1 modes are driving an increase in excited state population in pentacene.