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When the carrier frequency of a laser pulse fits to the energy difference between two electronic states of a molecule, the potential energy surfaces of these states dressed by the field overlap and the states can couple strongly to each other. Recently it has been predicted that these surfaces may exhibit a conical intersection (CI) for diatomic molecules. The emergence and impact of these Light-Induced Conical Intersection (LICI) have been discussed for diatomic molecules exposed to strong laser pulses of low frequencies. Available x-ray Free Electron Lasers (FEL) enable to access highly-excited electronic states which are all transient and their decay lifetimes intricately transfigure the emerging CIs induced by the FEL. These FEL-CIs lead to dramatic ultrafast non-adiabatic dynamics prominently manifested in observations. By varying the carrier frequency, duration, intensity, and polarization of the FEL pulse, the FEL-CI and hence the non-adiabatic effects can be controlled. In the present talk, the effect of FEL-CI on the dynamics of the resonant Auger effect of the core-excited C*O(1s-1π) molecule in an intense x-ray laser field is demonstrated and discussed. Particular attention is paid to the non-adiabatic coupling between the vibrational and rotational degrees of freedom of the CO molecule, triggered by FEL-CI.
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