Coherent xuv pulse induced resonant Auger process in the krypton atom

Abstract

We theoretically investigate the resonant Auger (RA) process via multiple core-excited states in the Kr atom in the presence of a coherent intense xuv pulse. Our results show the possibility of controlling the total energy-integrated electron yield, in the Kr atom, by appropriate combination and careful adjustment of the laser parameters from a coherent superposition of core-excited states. The simultaneous excitation of closely spaced core-excited states sets off interference in their common continuum, commonly termed as lifetime interference. We estimate the laser parameters essential for increasing the strength of this interference in the common continuum of two core-excited states. Our calculated electron spectra shows that an appropriate combination of pulse parameters favourably increases RA decay from one of the constituting core-excited states in the coherent superposition of core-excited states. We also find that variation of laser parameters can enhance RA decay from a core-excited state of comparatively low partial RA decay rate.