Theoretical characterization of the collective resonance states underlying the xenon giant dipole resonance

Abstract

We present a detailed theoretical characterization of the two fundamental collective resonances underlying the xenon giant dipole resonance (GDR). This is achieved consistently by two complementary methods implemented within the framework of the configuration-interaction singles (CIS) theory. The first method accesses the resonance states by diagonalizing the many-electron Hamiltonian using the smooth exterior complex scaling technique. The second method involves a new application of the Gabor analysis to wave-packet dynamics. We identify one resonance at an excitation energy of 74 eV with a lifetime of 27 as, and the second at 107 eV with a lifetime of 11 as. Our work provides a deeper understanding of the nature of the resonances associated with the GDR: a group of close-lying intrachannel resonances splits into two far-separated resonances through interchannel couplings involving the 4d electrons. The CIS approach allows a transparent interpretation of the two resonances as new collective modes. Due to the strong entanglement between the excited electron and the ionic core, the resonance wave functions are not dominated by any single particle-hole state. This gives rise to plasma-like collective oscillations of the 4d shell as a whole.

arXiv comment12 pages, 6 figures, 2 tables

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Cited by in corpus (12)

• Probe of Multi-electron Dynamics in Xenon by Caustics in High Order Harmonic Generation
• Atomic, molecular and optical physics applications of longitudinally coherent and narrow bandwidth Free-Electron Lasers
• Attosecond interferometry with self-amplified spontaneous emission of a free-electron laser
• Attosecond delay of xenon $4d$ photoionization at the giant resonance and Cooper minimum
• Relativistic time-dependent configuration-interaction singles
• Driving Rabi oscillations at the giant dipole resonance in xenon
• Effects of core space and excitation levels on ground-state correlation and photoionization dynamics of Be and Ne
• Nonlinear effects in photoionization over a broad photon-energy range within the TDCIS scheme
• Time-dependent configuration-interaction-singles calculation of the $5p$-subshell two-photon ionization cross section in xenon
• Quantum Estimation in Strong Fields: in situ ponderomotive sensing
• Sequential single-photon and direct two-photon absorption processes for Xe interacting with attosecond XUV pulses
• Collective resonances of atomic xenon from the linear to the nonlinear regime