Journal ArticleDOI
Energy Levels and Classifications of Doubly-Excited States in Two-Electron Systems with Nuclear Charge. Z = 1,2,3,4,5, below the N = 2 and N = 3 Thresholds
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TLDR
In this article, the truncated diagonalization method with hydrogenic basis functions was used to classify the doubly excited states in isoelectronic helium (Z = 1, 2, 3, 4, 5) into series and outer quantum number.About:
This article is published in Atomic Data and Nuclear Data Tables.The article was published on 1977-08-01. It has received 162 citations till now. The article focuses on the topics: Quantum number & Excited state.read more
Citations
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Journal ArticleDOI
Atomic negative-ion resonances
Stephen Buckman,Charles W. Clark +1 more
TL;DR: A review of experimental and theoretical approaches to the study of negative-ion resonances is given together with a consideration of the various schemes that are used for their classification in this paper, where the authors also highlight regularities in their behavior both within groups of the periodic table and along isoionic sequences.
Book ChapterDOI
Doubly excited states, including new classification schemes
TL;DR: In this article, a method of calculating the position and width of each doubly excited state of atoms and the approximate selection rules for different excitation processes is discussed, using correlation quantum numbers K, T, and A.
Journal ArticleDOI
High-resolution projectile Auger spectroscopy for Li, Be, B and C excited in single gas collisions. I. Line energies for prompt decays
M. Rødbro,R Bruch,P. Bisgaard +2 more
TL;DR: In this article, the ejected-electron spectra of highly excited autoionising levels of Li, Be, B and C have been studied by using the projectile electron spectroscopy method.
Journal ArticleDOI
Ro-vibrational collective interpretation of supermultiplet classifications of intrashell levels of two-electron atoms
TL;DR: In this paper, the authors investigated whether the intrashell portion of the double-excitation spectrum of the helium atom may be interpreted in terms of collective rotational and bending vibrational motion, analogous to the ro-vibrational motion of molecules.
References
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Journal ArticleDOI
Resonances in Electron Impact on Atoms
TL;DR: In this article, the authors discuss the experimental methods which are useful for studying these resonances, and review the results obtained by various investigators and discuss the configurations and other properties of resonances in atoms.
Journal ArticleDOI
Properties of autoionizing states of He
TL;DR: In this paper, the properties of Rydberg series of autoionizing levels of He converging to the n = 2 level of He+ are discussed on the basis of the assumption that the Schrodinger equation is approximately separable in the coordinates R = (r12 + r22)1/2 and α = tan-1 r2/r1.
Journal ArticleDOI
Comparison of doubly-excited helium energy levels, isoelectronic series, autoionization lifetimes, and group-theoretical configuration-mixing predictions with large-configuration-interaction calculations and experimental spectra
David R. Herrick,Oktay Sinanoǧlu +1 more
TL;DR: In this paper, the Rydberg series is used to predict three selection rules for dipole excitation and autoionization processes in the helium isoelectronic sequence, which agree with experiment.
Journal ArticleDOI
Classification of Two-Electron Excitation Levels of Helium
J. Cooper,Ugo Fano,F. Prats +2 more
TL;DR: In this article, a classification of the states that produce the autoionizing lines observed in spectra of He is considered, and properties of these states are discussed. (D.C.W.)
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Comparison of doubly-excited helium energy levels, isoelectronic series, autoionization lifetimes, and group-theoretical configuration-mixing predictions with large-configuration-interaction calculations and experimental spectra
David R. Herrick,Oktay Sinanoǧlu +1 more