Distorted wave and close coupling calculation of cross sections for H2—inert gas systems, mainly above the rotational threshold

1980 ◽  
Vol 51 (3) ◽  
pp. 427-447 ◽  
Author(s):  
Monique Jacobs ◽  
J. Reuss ◽  
J. van de Ree
Keyword(s):  
Cross Sections ◽  
Inert Gas ◽  
Distorted Wave ◽  
Close Coupling ◽  
Coupling Calculation

Electron Collisional Excitation of S XII

1982 ◽  
Vol 37 (8) ◽  
pp. 744-751
Author(s):  
H. P. Saha ◽  
E. Trefftz
Keyword(s):  
Cross Sections ◽  
Transition Probabilities ◽  
Energy Levels ◽  
Theoretical Work ◽  
Wave Functions ◽  
Atomic Data ◽  
Collisional Excitation ◽  
Distorted Wave ◽  
Close Coupling ◽  
Target Wave

Atomic data have been obtained for the coronal ion S XII using the UCL program codes. Energy levels and radiative transition probabilities have been computed with different target descriptions allowing for configuration interaction and relativistic effects. Multi-configuration Hartree-Fock method is used to calculate the target wave functions. Collisional excitation cross sections between the 2 s2 2 p 2P0, 2s2p2 4P, 2D, 2S, 2P and the 2p34S0, 2D0, 2P0 eigenstates of S XII have been calculated using eight-state close coupling and distorted wave approximations with a target description employing a 3̄̄̄d̅ pseudo orbital. Collision strengths between the lowest five eigenstates of S XII have also been computed in five-state close coupling and distorted wave approximations for comparison. The results are compared with available theoretical work. It is found that the use of elaborate target wave functions and the choice of a more accurate scattering approximation may change the cross sections by more than 25% in some of the transitions

scholarly journals Hyperspherical close-coupling calculation of D-wave positronium formation and excitation cross sections in positron–hydrogen scattering

1996 ◽  
Vol 74 (7-8) ◽  
pp. 353-359 ◽  
Author(s):  
Yan Zhou ◽  
C. D. Lin
Keyword(s):  
Cross Sections ◽  
Atomic Hydrogen ◽  
Positronium Formation ◽  
Close Coupling ◽  
Inelastic Threshold ◽  
Excitation Cross Sections ◽  
Coupling Calculation ◽  
Positron Collisions ◽  
Potential Curves ◽  
D Wave

The hyperspherical close-coupling method is used to calculate the elastic, positronium-formation, and excitation cross sections for positron collisions with atomic hydrogen at energies below the H (n = 4) threshold for the J = 2 partial wave. The resonances below each inelastic threshold were also analyzed. The adiabatic hyperspherical potential curves are used to identify the nature of these resonances.

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