Near-threshold behavior of the [ital K]-shell satellites in CO

Journal Article · Wed Jun 01 04:00:00 EDT 1994 · Physical Review A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.49.4570· OSTI ID:7307560

Reich, T; Heimann, P A; Petersen, B L; Hudson, E; Hussain, Z; Shirley, D A ^[1]

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1. Chemical Sciences Division, Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720 (United States) Departments of Chemistry and Physics, Pennsylvania State University, University Park, Pennsylvania 16802 (United States) Accelerator and Fusion Research Division, Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720 (United States)

The study of photoelectron satellites in the near-threshold region is important for differentiating among various electron correlation mechanisms. For CO, which is a prominent test case for theories describing electron correlation effects, the threshold and near-threshold branching ratios (BR's) of the [ital K]-shell satellites were measured. Eight different C 1[ital s] satellite states were identified, showing very complex threshold behavior. The resonancelike behavior of the (2[sigma])[sup [minus]1](1[pi])[sup [minus]1](2[pi][sup *])[sup 1]([ital S][prime]=1) satellite BR agrees with recent theoretical calculations. The observed energy dependence of the singlet (2[sigma])[sup [minus]1](1[pi])[sup [minus]1](2[pi][sup *])[sup 1] satellite compares less well with the calculations. Three [sup 2][Sigma][sup +] satellites with a (2[sigma])[sup [minus]1](5[sigma])[sup [minus]1]([ital n][sigma])[sup 1] configuration have a constant satellite BR over the energy range studied. Three 2[sigma] satellites, which have been assigned as pure conjugate shake-up states, have intensity only near threshold. The threshold spectrum above the O 1[ital s] ionization threshold consists of two distinct groups of satellites. Conjugate shake-up transitions contribute to the intense feature centered at 551-eV binding energy, which is not observed above its threshold. Two [sup 2][Sigma][sup +] satellites, which have been described by configuration interaction of (1[sigma])[sup [minus]1](5[sigma])[sup [minus]1]([ital n][sigma])[sup 1] states with a singlet [pi][pi][sup *] state, show indications of shape-resonance-like behavior.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 7307560
• Journal Information: Physical Review A; (United States), Journal Name: Physical Review A; (United States) Vol. 49:6; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

664200* -- Spectra of Atoms & Molecules & their Interactions with Photons-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
CORRELATIONS
ELECTRON CORRELATION
ELECTRONIC STRUCTURE
ENERGY
ENERGY SPECTRA
FINE STRUCTURE
IONIZATION
K SHELL
OXIDES
OXYGEN COMPOUNDS
PHOTOIONIZATION
SPECTRA
THRESHOLD ENERGY