Selective population of spin-orbit levels in the autoionization of O2
- 28 September 1993
- journal article
- Published by IOP Publishing in Journal of Physics B: Atomic, Molecular and Optical Physics
- Vol. 26 (18) , 3081-3099
- https://doi.org/10.1088/0953-4075/26/18/017
Abstract
Autoionization processes in O2 have been studied by measuring photoelectrons in the photon energy region between the O2+ X 2 Pi g and a 2 Pi u ionic states (12.4-15 eV). The present experimental results provide comprehensive information about autoionization dynamics since the decay routes from the spin-orbit components of the neutral autoionizing states to the two spin-orbit components of the ground ionic state are resolved. The intensity ratio of the O2+ X 2 Pi 1/2 and 2 Pi 3/2 components has been determined and strong Omega to Omega + selectivity has been observed. The observed selectivity is explained in terms of a model in which the orbital angular momentum along the internuclear axis of the positive ion core remains unchanged during the autoionization process. Using this model, Rydberg orbitals of the I, I' and I" autoionizing states are reassigned as 4s sigma g, 3d delta g and 3d sigma g, respectively, and the spin-orbit constant of the J state is determined.Keywords
This publication has 21 references indexed in Scilit:
- Photoelectron studies of the resonant excitation and ionization of the Kr 3d inner subshell in the low kinetic energy regionJournal of Physics B: Atomic, Molecular and Optical Physics, 1992
- A novel position-sensitive detector using an image-sensing integrated circuitReview of Scientific Instruments, 1992
- Highly selective population of spin-orbit levels in electronic autoionization ofPhysical Review Letters, 1991
- The performance of a 5 metre normal incidence monochromator at the Daresbury Laboratory Synchrotron Radiation SourceNuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 1989
- A variable angle photoelectron spectrometer using a position-sensitive detectorJournal of Electron Spectroscopy and Related Phenomena, 1985
- The I, I′, and I″ absorption bands of O2 in the region 790–865 ÅJournal of Molecular Spectroscopy, 1981
- Photoexcitation and ionization in molecular oxygen: Theoretical studies of electronic transitions in the discrete and continuous spectral intervalsThe Journal of Chemical Physics, 1980
- High resolution study of photoionization processes in O2The Journal of Chemical Physics, 1975
- Autoionization and the photoelectron spectra of oxygenInternational Journal of Mass Spectrometry and Ion Physics, 1973
- New Ultra-Violet Spectrum of HeliumThe Astrophysical Journal, 1930