Effects of intense chirped x-ray laser on resonant Auger process through multiple core-excited states

Abstract

In the context of the recent reported results indicating chirped laser induced suppression of resonant Auger effect the author investigates the effects of chirping on the resonant Auger process from a coherent superposition of core-excited states and direct ionization from the ground state. It is found that for the positive chirping case total electron yield initially increases with increase in chirp rate eventually decreasing with further increase in chirp rate. However, in the case of negative chirping total electron yield always decreases with increase in chirp rate. The results demonstrate the possibility of controlling Rabi oscillations between ground and core-excited states through the variation of chirp rate. It is also found that the variation of chirp rate significantly influences the peak magnitude of the two peaks visible in the electron spectrum. The author also studies the effects of chirping of the laser on the electron spectrum computed for direct ionization from the ground state. The calculated results indicate that chirping of x-ray pulse can modify the signatures of interference between two competing pathways in the electron spectrum.