Theoretical Investigation of Femtosecond-Resolved Photoelectron Spectra of the Li₂ Molecule

The time-dependent quantum wave packet method is used to investigate the dynamics for the Li₂ molecule, and the time-resolved photoelectron spectra (TRPES) of the Li₂ molecule are calculated. At the short delay time, the particular phenomenon of TRPES with four peaks is qualitatively interpreted in a dressed state picture by analyzing wave packet motion on light-induced potential (LIP). The significant difference in the electronic structure of E¹∑_g⁺ between the inner and outer turning points has an impact on the TRPES. The control for the first excited state A¹∑_u⁺ of the initial wave packet is discussed.