Autler--Townes Splitting in Photoelectron Spectrum of Three-Level Li₂ Molecule in Ultrashort Pulse Laser Fields

The Autler--Townes (AT) splitting in femtosecond photoelectron spectrum
of three-level Li₂ molecules is theoretically investigated using time-dependent quantum wave packet method. With proper femtosecond laser pulses, three peaks of the AT splitting can be observed in the photoelectron spectrum. The AT splitting stems from rapid Rabi oscillation caused by intense ultrashort laser pluses. The effects of laser parameters on the molecular ionization dynamics are also discussed.