Ground bound states in two-electron systems with Z=1

1989 ◽  
Vol 22 (8) ◽  
pp. 1263-1268 ◽  
Author(s):  
A M Frolov ◽  
A Y Yeremin
Keyword(s):  
Bound States ◽  
Electron Systems

scholarly journals Scattering and Its Applications to Various Atomic Processes: Elastic Scattering, Resonances, Photoabsorption, Rydberg States, and Opacity of the Atmosphere of the Sun and Stellar Objects

Atoms ◽  
2020 ◽  
Vol 8 (4) ◽  
pp. 78
Author(s):  
Anand K. Bhatia
Keyword(s):  
Elastic Scattering ◽  
Long Range ◽  
Short Range ◽  
Bound States ◽  
Rydberg States ◽  
Stellar Atmospheres ◽  
Electron Systems ◽  
Short Range Correlations ◽  
Hybrid Theory ◽  
Scattering Resonances

A scattering process can be a natural process or a process carried out in a laboratory. The scattering of particles from targets has resulted in important discoveries in physics. We discuss various scattering theories of electrons and positrons and their applications to elastic scattering, resonances, photoabsorption, excitation, and solar and stellar atmospheres. Among the most commonly employed approaches are the Kohn variational principle, close-coupling approximation, method of polarized orbitals, R-matrix formulation, and hybrid theory. In every formulation, an attempt is made to include exchange, long-range and short-range correlations, and to make the approach variationally correct. The present formulation, namely, hybrid theory, which is discussed in greater detail compared to other approximations, includes exchange, long-range correlations, and short-range correlations at the same time, and is variationally correct. It was applied to calculate the phase shifts for elastic scattering, the resonance parameters of two-electron systems, photoabsorption in two-electron systems, excitation of atomic hydrogen by an electron and positron impact, and to study the opacity of the Sun’s atmosphere. Calculations of polarizabilities, Rydberg states, and bound states of atoms are also discussed.

scholarly journals Absence of Cooper-type bound states in three- and few-electron systems

1998 ◽  
Vol 5 (2) ◽  
pp. 219-222 ◽  
Author(s):  
S.K. Adhikari ◽  
T. Frederico
Keyword(s):  
Bound States ◽  
Electron Systems

Quasi-algebraic treatment of bound states of simple one-electron systems

1993 ◽  
Vol 12 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Francisco M. Fern�ndez ◽  
Eduardo A. Castro
Keyword(s):  
Bound States ◽  
Electron Systems ◽  
Algebraic Treatment

Recent Radiative and Collisional Atomic Data of Astrophysical Interest

1988 ◽  
Vol 102 ◽  
pp. 129-132
Author(s):  
K.L. Baluja ◽  
K. Butler ◽  
J. Le Bourlot ◽  
C.J. Zeippen
Keyword(s):  
Mass Production ◽  
Bound States ◽  
Physical Models ◽  
Impact Excitation ◽  
Electron Impact Excitation ◽  
Atomic Data ◽  
Isoelectronic Sequence ◽  
Astrophysical Interest ◽  
Radiative Transitions ◽  
Forbidden Transitions

SummaryUsing sophisticated computer programs and elaborate physical models, accurate radiative and collisional atomic data of astrophysical interest have been or are being calculated. The cases treated include radiative transitions between bound states in the 2p4and 2s2p5configurations of many ions in the oxygen isoelectronic sequence, the photoionisation of the ground state of neutral iron, the electron impact excitation of the fine-structure forbidden transitions within the 3p3ground configuration of CℓIII, Ar IV and K V, and the mass-production of radiative data for ions in the oxygen and fluorine isoelectronic sequences, as part of the international Opacity Project.

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