Influence of nuclear motion on resonant two-center photoionization
arXiv:2004.02459 · doi:10.1103/PhysRevA.102.012818
Abstract
Photoionization of an atom in the presence of a neighboring atom of different species is studied. The latter first undergoes resonant photoexcitation, leading to an autoionizing state of the diatomic system. Afterwards, the excitation energy is transferred radiationlessly via a two-center Auger process to the other atom, causing its ionization. Assuming a fixed internuclear distance, it has been predicted theoretically that this indirect ionization pathway can strongly dominate over the direct photoionization. Here, we extend the theory of resonant two-center photoionization by including the nuclear motion in van-der-Waals molecules. An analytical formula is derived reflecting the influence of molecular vibrational dynamics on the relative strength of the two-center channel. For the specific example of Li-He dimers we show that the two-center autoionizing resonances are split by the nuclear motion into multiplets, with the resonance lines reaching a comparable level of enhancement over direct photoionization as is obtained in a model based on spatially fixed nuclei.
References in corpus (11)
- Interatomic Coulombic Decay following Photoionization of the Helium Dimer: Observation of Vibrational Structure
- Vibrationally Resolved Decay Width of Interatomic Coulombic Decay in HeNe
- Two-center resonant photo ionization
- Highly efficient double ionization of mixed alkali dimers by intermolecular Coulombic decay
- Photoelectron ionization spectra in a system interacting with a neighbor atom
- Resonant two-photon single ionization of two atoms
- Quantum correlation and entanglement between an ionizing system and a neighbor atom interacting directly and via a quantized field
- Resonant electron scattering and dielectronic recombination in two-center atomic systems
- Resonant single-photon double ionization driven by combined intra- and interatomic electron correlations
- Two-center electron-impact ionization via collisional excitation-autoionization
- Strong-field photoionization in two-center atomic systems