Fig. 6
From: Excited-state vibrational dynamics toward the polaron in methylammonium lead iodide perovskite
Excited-state potential energy surface diagram. The diagram displays the atomically displaced (∆Str, ∆Bend) polaron state surface relative to the ground state (0, 0) neutral surface after excitation. A coherent nuclear wave packet oscillates along the I–Pb–I stretching coordinate and propagates toward ∆Bend along the I–Pb–I bending coordinate. SFC, Sneu, and Spol are relative structures of Franck–Condon state, neutral, and polaron states
