Qiang Zheng

TL;DR: This work presents the simultaneous experimental characterization of one-photon and two- photon excitation channels in isolated CF3I molecules using ultrafast gas-phase electron diffraction and mapped out the real-space trajectories of a coherent nuclear wave packet, which bifurcates onto two potential energy surfaces when passing through a conical intersection.

TL;DR: The important role of light-induced structural deformations within the inorganic sublattice in elucidating the unique optoelectronic functionality exhibited by hybrid perovskites is shown and new understanding of hot carrier—lattices interactions, which fundamentally determine solar cell efficiencies is provided.

TL;DR: In this paper, the authors observed a substantial acceleration of the ring-opening motion after internal conversion to the ground state due to steepening of the electronic potential gradient towards the product minima and demonstrated the potential of megaelectronvolt ultrafast electron diffraction to elucidate photochemical reaction paths in organic chemistry.

TL;DR: The results constrain the electron-ion coupling rate, determine the Debye temperature, and reveal the melting sensitivity to nucleation seeds, which shows evidence for the heterogeneous coexistence of solid and liquid.

TL;DR: The photochemical electrocyclic ring-opening of 1,3-cyclohexadiene is a textbook organic chemistry reaction that is resolved on the level of atomic distances and on its natural femtosecond timescale using megaelectronvolt ultrafast electron diffraction.