Theoretical study of complex resonances near ionization thresholds: Application to thephotoionization spectrum
- 1 December 1984
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 30 (6), 3057-3065
- https://doi.org/10.1103/physreva.30.3057
Abstract
A "complex" resonance, due to the autoionization of a Rydberg series close to its ionization limit perturbed by an interloper, appears frequently in photoionization spectra. This resonance structure is studied by means of an analytical formula derived from a multichannel quantum-defect treatment involving one open and two closed channels. Model calculations demonstrate the effect of the interaction between the two closed channels. Examples taken from the Ba and spectra are discussed. Finally, we reproduce the general feature of a complex resonance observed in the 785-Å region of the photoionization spectrum, using ab initio electronic parameters and taking account of the rotational structure.
Keywords
This publication has 21 references indexed in Scilit:
- Photoionization of N2 X 1Σ+g, v″=0 and 1 near threshold. Preionization of the Worley–Jenkins Rydberg seriesThe Journal of Chemical Physics, 1984
- Alternative parameters of channel interactions. I. Symmetry analysis of the two-channel couplingJournal of Physics B: Atomic and Molecular Physics, 1984
- Ab initio approach to the multichannel quantum defect calculation of the electronic autoionisation in the Hopfield series of N2Journal of Physics B: Atomic and Molecular Physics, 1983
- Spectroscopy in the ionisation continuum. Vibrational preionisation in H2 calculated by multichannel quantum-defect theoryFaraday Discussions of the Chemical Society, 1981
- A multichannel quantum defect approach to molecular autoionizationChemical Physics Letters, 1980
- Calculation of rotational–vibrational preionization in H2 by multichannel quantum defect theoryThe Journal of Chemical Physics, 1980
- Very high resolution study of photoabsoprtion, photoionization, and predissociation in H2The Journal of Chemical Physics, 1976
- Configuration Interaction Theory. Effects of Overlapping ResonancesPhysical Review B, 1968
- Quantum defect theory I. General formulationProceedings of the Physical Society, 1966
- Effects of Configuration Interaction on Intensities and Phase ShiftsPhysical Review B, 1961