Dynamical suppression of atomic peaks in resonant dissociative photoemission

Resonant excitation to the F1s-σ* dissociative state in hydrogen fluoride gives a photoelectron spectrum where the spectator part contains strong atomic lines but a participator part where such lines are lacking. We demonstrate that this contrasting behaviour between the two parts is due to a strong dynamical suppression of the resonant contribution, making direct main state photoionization the dominating channel even at resonant conditions

Bond-distance-dependent decay probability of the N 1s→π* core-excited state in N2

We report the observation of the unusually weak decay of the N 1s→π* core-excited N2 molecule to the B 2Σu+ final state of N2+, which is only detectable in an experiment with high sensitivity. The resonant Auger spectra exhibit an unexpected dependence on the selected vibrational level of the intermediate state. Theoretical calculations show that the interference between direct and resonant photoemission as well as a strong geometry dependence of the decay probability on the bond distance give rise to the observed features