Tracing Direct And Sequential Two-Photon Double Ionization Of D-2 In Femtosecond Extreme-Ultraviolet Laser Pulses

Two-photon double ionization (TPDI) of D-2 is studied for 38-eV photons at the Free Electron Laser in Hamburg (FLASH). Based on model calculations, instantaneous and sequential absorption pathways are identified as separated peaks in the measured D+ + D+ fragment kinetic energy release (KER) spectra. The instantaneous process appears at high KER, corresponding to ionization at the molecule's equilibrium distance, in contrast to sequential ionization mainly leading to low-KER contributions. Measured fragment angular distributions are in good agreement with theory.