Unraveling Vibrational Wavepacket Dynamics using Femtosecond Ion Yield Spectroscopy and Photoelectron Imaging

摘要

Time-resolved photoionization is a powerful experimental approach to unravel the excited state dynamics in isolated polyatomic molecules.Depending on species of the collected signals,different methods can be performed:time-resolved ion yield spectroscopy (TR-IYS)and time-resolved photoelectron imaging (TR-PEI).In this review,the essential concepts linking photoionization measurement with electronic structure are presented,together with several important breakthroughs in experimentally distinguishing the oscillating wavepacket motion between different geometries.We illustrate how femtosecond TR-IYS and TR-PEI are employed to visualize the evolution of a coherent vibrational wavepacket on the excited state surface.