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Effects of Configuration Interaction on Intensities and Phase Shifts

1961/12/15 by U. Fano · 11,117 citations
Physics and Astronomy · #Advanced Chemical Physics Studies #Atomic physics #Cold Atom Physics and Bose-Einstein Condensates #Configuration interaction #Connection (principal bundle) #Electron #Excitation #Excited state #Inelastic scattering #Ionization #Physics #Quantum mechanics #Resonance (particle physics) #Rydberg formula #Scattering #Spectral line #Spectroscopy and Quantum Chemical Studies

paper · doi:10.1103/physrev.124.1866

published in Physical Review 124(6), 1866-1878 (American Institute of Physics)

openalex publication_date 1961/12/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06

Abstract

The interference of a discrete autoionized state with a continuum gives rise to characteristically asymmetric peaks in excitation spectra. The earlier qualitative interpretation of this phenomenon is extended and revised. A theoretical formula is fitted to the shape of the 2s2p1P resonance of He observed in the inelastic scattering of electrons. The fitting determines the parameters of the 2s2p1P resonance as follows: E=60.1 ev, \ensuremathΓ\ensuremath∼0.04 ev, f\ensuremath∼2 to 4\ifmmode×\else\texttimes\fi10^\ensuremath-3. The theory is extended to the interaction of one discrete level with two or more continua and of a set of discrete levels with one continuum. The theory can also give the position and intensity shifts produced in a Rydberg series of discrete levels by interaction with a level of another configuration. The connection with the nuclear theory of resonance scattering is indicated.

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