As the nuclear density approaches the CIs, at t = 50 fs (central panel), the magnitude of the TDVP increases. This behavior can be easily explained having in mind the double-cone shape of the adiabatic PESs, with the slope of the S 1 PES inducing the nuclear density to efficiently relax towards S 0 via the CIs. At the final time shown in Fig. , t = 100 fs (right panel), the magnitude of the TDVP reflects the interference patterns already observed in the TDPES, with a clear separation between the smooth behavior in the cis region |ϕ| < π 2 and a highly oscillatory behavior mainly identified in the trans region |ϕ| > π 2 . In all panels in Fig. , the vector field representing the direction of the TDVP is nearly parallel to the horizontal axis, indicating that the q component of the momentum field is much smaller than the ϕ component. This results in dynamics mainly characterized by motion from the cis to the trans configuration.