Experimental and (first-order many-body) theoretical differential and integral cross sections for excitation of then=3states of He by electron impact at 29.2 and 39.7 eV

1975 ◽  
Vol 11 (5) ◽  
pp. 1583-1595 ◽  
Author(s):  
Ara Chutjian ◽  
Lowell D. Thomas
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Many Body ◽  
First Order

Excitation from metastable 23S states of helium by electrons and positrons

1996 ◽  
Vol 74 (7-8) ◽  
pp. 521-526 ◽  
Author(s):  
Surbhi Verma ◽  
Rajesh Srivastava
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Impact Excitation ◽  
Electron Impact Excitation ◽  
Many Body ◽  
Many Body Theory ◽  
Electrons And Positrons ◽  
Body Theory ◽  
Orientation Parameters ◽  
Approximation Calculation

Our recent distorted-wave approximation calculation for the electron-impact excitation cross sections of the helium atom from its 23S state to upper states was extended to obtain alignment and orientation parameters for n3P (n = 2, 3, 4) excitations. Further, similar results are obtained by considering the excitation by impact of positrons. The calculated alignment and orientation results are compared with the only available theoretical electron-impact results obtained using first-order many-body theory.

The Scattering Equations for Charged Particles Colliding with Many Body Systems

1975 ◽  
Vol 53 (17) ◽  
pp. 1615-1623 ◽  
Author(s):  
T. D. Bui ◽  
A. D. Stauffer
Keyword(s):  
Cross Sections ◽  
Adiabatic Approximation ◽  
Perturbation Technique ◽  
Sodium Atom ◽  
Orbital Method ◽  
Many Body ◽  
First Order ◽  
Atom Scattering ◽  
Alkali Atoms ◽  
Many Body Systems

We have derived the total wave function of a many body system scattering by a charged particle by using a first order perturbation technique (the polarized orbital method). The derivation is based on an adiabatic approximation for the incoming particle. Particular cases of electrons colliding with the alkali atoms are shown. S, P, and D wave phase shifts and the total elastic cross sections for electron–sodium atom scattering are calculated using this method for the energy range 0 to 4 eV.

Relativistic R-matrix close-coupling method based on the effective many-body Hamiltonian: electron-impact excitation of the 3s2 1S0–3s3p1P1o electric dipole-allowed transition of the Ar6+ ion1This article is part of a Special Issue on the 10th International Colloquium on Atomic Spectra and Oscillator Strengths for Astrophysical and Laboratory Plasmas.

2011 ◽  
Vol 89 (4) ◽  
pp. 457-463
Author(s):  
Juan A. Santana ◽  
Yasuyuki Ishikawa
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Electric Dipole ◽  
Coupling Method ◽  
Impact Excitation ◽  
Electron Impact Excitation ◽  
Many Body ◽  
Close Coupling ◽  
R Matrix ◽  
Excitation Cross Sections

Electron-impact excitation cross sections of the electric dipole-allowed 3s2 1S0–3s3p [Formula: see text] transition in Mg-like argon (Ar6+) are calculated using the configuration-interaction and effective many-body Hamiltonian R-matrix close-coupling methods. The near-threshold electron-impact excitation cross sections computed with the effective many-body Hamiltonian R-matrix close-coupling method are in good agreement with the benchmark experimental results.

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