Sequential single-photon and direct two-photon absorption processes for Xe interacting with attosecond XUV pulses

Abstract

We investigate the interaction of Xe with isolated attosecond XUV pulses. Specifically, we calculate the ion yields and determine the pathways leading to the formation of ionic charged states up to Xe${}^{5+}$. To do so, in our formulation we account for single-photon absorption, sequential multi-photon absorption, direct two-photon absorption, single and double Auger decays, and shake-off. We compare our results for the ion yields and for ion yield ratios with recent experimental results obtained for 93 eV and 115 eV attosecond XUV pulses. In particular, we investigate the role that a sequence of two single-photon ionization processes plays in the formation of Xe${}^{4+}$. We find that each one of these two processes ionizes a core electron and thus leads to the formation of a double core-hole state. Remarkably, we find that the formation of Xe${}^{5+}$ involves a direct two-photon absorption process and the absorption of a total of three photons.

arXiv comment8 pages, 4 figures

References in corpus (7)

• Molecular double core-hole electron spectroscopy for chemical analysis
• Monte Carlo calculation of ion, electron, and photon spectra of xenon atoms in x-ray free-electron laser pulses
• Interplay between relativistic energy corrections and resonant excitations in x-ray multiphoton ionization dynamics of Xe atoms
• Theoretical characterization of the collective resonance states underlying the xenon giant dipole resonance
• Interaction of molecular nitrogen with Free-Electron-Laser radiation
• Route to Direct Multiphoton Multiple Ionization
• Auger spectra following inner-shell ionization of Argon by a Free-Electron Laser