Fig. 1: UED experimental setup and observations.
From: Photoinduced anisotropic lattice dynamic response and domain formation in thermoelectric SnSe
a Schematic of the ultrafast laser-pump electrons-probe setup to study photoinduced lattice dynamics in SnSe. The crystallographic axes are labeled. b Temporal evolution of the normalized diffraction intensity I/I0 of Bragg peaks {020}, {040}, {002} and {004} at 90 K. The solid lines are fits of {020}, {002} and {004} using a single-exponential function; the solid line for the {040} peak intensity is fitted to a double-exponential function. The time constant for each plot is inserted. c, d Normalized intensity calculated based on structure factors as a function of thermal vibration <u2> (c) and atomic displacement Δz for {002} and {004} reflections (d).
