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.

Three-body distorted-wave Born approximation for electron-atom ionization

1993 ◽  
Vol 48 (1) ◽  
pp. R22-R25 ◽  
Author(s):  
S. Jones ◽  
D. H. Madison ◽  
A. Franz ◽  
P. L. Altick
Keyword(s):  
Born Approximation ◽  
Distorted Wave ◽  
Distorted Wave Born Approximation ◽  
Electron Atom ◽  
Three Body ◽  
Atom Ionization

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 Calculation of Electron Impact Ionisation of Atomic Hydrogen with the Exact Final-state Boundary Conditions

1994 ◽  
Vol 47 (2) ◽  
pp. 123 ◽  
Author(s):  
Dmitry A Konovalov ◽  
Ian E McCarthy
Keyword(s):  
Cross Sections ◽  
Electron Correlation ◽  
Theoretical Method ◽  
Distorted Wave ◽  
Distorted Wave Born Approximation ◽  
Final State ◽  
Exact Boundary ◽  
State Boundary ◽  
Impact Ionisation ◽  
Theory And Experiment

We present a new and very powerful theoretical method-a distorted-wave Born approximation (DWBA) with an arbitrary final-state electron-electron correlation function. This method combines the flexibility of including any theoretically desired electron-electron correlation and the physical clarity of the DWBA method. Calculations explore the use of an auxiliary final-state wave function with the exact boundary condition, in attempting to describe the absolute cross sections for ionisation of helium in coplanar symmetric kinematics and to resolve discrepancies between theory and experiment.

Sign in / Sign up

Export Citation Format

Share Document