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
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