State interference in resonance Auger and x-ray emission

Journal Article · Sat Feb 29 23:00:00 EST 1992 · Physical Review A. General Physics; (United States)

DOI:https://doi.org/10.1103/PhysRevA.45.2833· OSTI ID:7234530

Cesar, A; Agren, H ^[1]

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1. Institute of Quantum Chemistry, University of Uppsala, Box 518, S-75120, Uppsala (Sweden)

Starting from a scattering-theory formulation, cross sections for Auger and x-ray decay from energetically shifted inner-shell states are derived. Two situations are studied: (i) when there are several close-lying intermediate core-hole states with no vibrational excitations, in which case a {ital state} {ital interference} effect is identified; and (ii) when there are several close-lying intermediate states with vibrational excitations, in which case a {ital vibronic} {ital interference} effect is identified. In the latter case, the present formalism is a many-state generalization of the {ital vibrational} {ital interference} {ital effects} derived from the same type of scattering formalism in our previous paper (A. Cesar, H. Agren, and V. Carravetta, Phys. Rev. A 40, 187 (1989)). Applications are carried out for spectra of some few-state model systems. It is found that a conventional analysis in terms of discrete noninteracting (noninterfering) states, such as the one-center decomposition model, is only valid when the ratio ({ital R}) between energy shift and lifetime is sufficiently large. For states with small {ital R}, a more complete theoretical account must be undertaken, including, e.g., the calculation of phases of the respective transition moments. The presented formalism applies to resonance Auger or x-ray emission spectra, to Auger and x-ray emission from core-electron shake-up states, and also, under certain circumstances, to emission from chemically shifted core-hole states.

• OSTI ID: 7234530
• Journal Information: Physical Review A. General Physics; (United States), Journal Name: Physical Review A. General Physics; (United States) Vol. 45:5; ISSN 1050-2947; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

664100* -- Theory of Electronic Structure of Atoms & Molecules-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ATOMS
AUGER EFFECT
CROSS SECTIONS
ELECTROMAGNETIC RADIATION
EMISSION SPECTRA
ENERGY-LEVEL TRANSITIONS
EXCITATION
FLUORESCENCE
HOLES
INNER-SHELL EXCITATION
INTERFERENCE
IONIZING RADIATIONS
LUMINESCENCE
MOLECULES
RADIATIONS
RESONANCE FLUORESCENCE
SPECTRA
X RADIATION