scholarly journals Transfer of Angular Momentum in Electron Collisions with Alkali Atoms

1999 ◽  
Vol 52 (3) ◽  
pp. 515 ◽  
Author(s):  
B. V. Hall ◽  
M. Shurgalin ◽  
A. J. Murray ◽  
W. R. MacGillivray ◽  
M. C. Standage
Keyword(s):  
Angular Momentum ◽  
Measured Data ◽  
Distorted Wave ◽  
Poor Agreement ◽  
Distorted Wave Born Approximation ◽  
Electron Collisions ◽  
Close Coupling ◽  
First Order ◽  
Alkali Atoms ◽  
Relativistic Interaction

Measurements of the transfer of angular momentum to rubidium and sodium atoms in collisions with electrons are reported. For excitation of the rubidium 52S1/2–52 P3/2 transition, it is found that existing first order distorted wave Born approximation calculations show poor agreement with the data and that a model which includes the relativistic interaction between the electrons and the atoms in the potential is needed. For the de-excitation of the sodium 42S1/2 –32 P3/2 transition, a long standing proposal relating to the sign of the transferred angular momentum is not supported except at small scattering angles. A convergent close coupling calculation displays excellent agreement with the measured data.

scholarly journals The Distorted-Wave Born Approach for Calculating Electron-Impact Ionization of Molecules

2010 ◽  
Vol 2010 ◽  
pp. 1-24 ◽  
Author(s):  
Don H. Madison ◽  
Ola Al-Hagan
Keyword(s):  
Electron Impact ◽  
Born Approximation ◽  
Impact Ionization ◽  
Intermediate Energy ◽  
Electron Impact Ionization ◽  
Distorted Wave ◽  
Distorted Wave Born Approximation ◽  
Electron Collisions ◽  
Single Ionization ◽  
Theoretical Approaches

The distorted-wave Born approximation (DWBA) has been one of the most successful theoretical approaches for treating electron collisions with complicated atoms, and recently the DWBA has been successfully extended to treat electron-impact ionization of molecules. The purpose of this paper is to give an overview of that development and to provide a summary of the recent experimental and theoretical works examining low to intermediate energy electron-impact single ionization of molecules.

scholarly journals The Electron - Atom Ionisation Problem

1996 ◽  
Vol 49 (2) ◽  
pp. 219
Author(s):  
IE McCarthy
Keyword(s):  
Computational Method ◽  
Independent Experiment ◽  
Three Body Problem ◽  
Distorted Wave ◽  
Distorted Wave Born Approximation ◽  
Final State ◽  
Close Coupling ◽  
Electron Atom ◽  
Coulomb Boundary Conditions ◽  
Three Body

Methods of calculating electron–atom ionisation as a three-body problem with Coulomb boundary conditions are considered. In the absence of a fully-valid computational method for a time-independent experiment the approximation is made that the incident electron experiences a screened potential. Approximations involving a final state that obeys the three-body Coulomb boundary condition are compared with the distorted-wave Born approximation and the convergent close-coupling method.

Multi-channel distorted-wave Born approximation for rovibrational transition rates in molecular collisions

2021 ◽  
Vol 155 (3) ◽  
pp. 034105
Author(s):  
Taha Selim ◽  
Arthur Christianen ◽  
Ad van der Avoird ◽  
Gerrit C. Groenenboom
Keyword(s):  
Born Approximation ◽  
Transition Rates ◽  
Distorted Wave ◽  
Distorted Wave Born Approximation ◽  
Molecular Collisions

scholarly journals Numerical Solution of the Spinor-Spinor Bethe-Salpeter Equation in Functional Nonlinear Spinor Theory

1975 ◽  
Vol 30 (5) ◽  
pp. 656-671
Author(s):  
W. Bauhoff
Keyword(s):  
Angular Momentum ◽  
Excited State ◽  
Variational Method ◽  
Numerical Solution ◽  
High Precision ◽  
Nonlinear Spinor ◽  
Spinor Theory ◽  
First Order ◽  
Scalar Mesons ◽  
Functional Methods

AbstractThe mass eigenvalue equation for mesons in nonlinear spinor theory is derived by functional methods. In second order it leads to a spinorial Bethe-Salpeter equation. This is solved by a variational method with high precision for arbitrary angular momentum. The results for scalar mesons show a shift of the first order results, obtained earlier. The agreement with experiment is improved thereby. An excited state corresponding to the η' is found. A calculation of a Regge trajectory is included,too.

Analysing powers and differential cross sections of (3He,p) reactions on 6Li and 7Li at low energy

1995 ◽  
Vol 73 (1-2) ◽  
pp. 74-84 ◽  
Author(s):  
D. Baddou ◽  
C. Rioux ◽  
R. J. Slobodrian ◽  
J. M. Nelson
Keyword(s):  
Cross Sections ◽  
Differential Cross ◽  
Born Approximation ◽  
Low Energy ◽  
Angular Distributions ◽  
Differential Cross Sections ◽  
Distorted Wave ◽  
Distorted Wave Born Approximation ◽  
Nucleon Transfer ◽  
Cluster Transfer

Angular distributions of the differential cross sections and analysing powers were measured at an energy of 4.6 MeV. The results are compared with the distorted wave Born approximation predictions for two-nucleon transfer and for a deuteron-cluster transfer. The agreement is qualitative at best, and a discussion of alternatives to improve it is presented.

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