
TY  - JOUR
A1  - McCarthy, IE 
A1  - Stelbovics, AT 
T1  - Study of Approximations for Electron?Atom Direct Reactions
JF  - Australian Journal of Physics
JO  - Aust. J.  Phys.
Y1  - 1983
VL  - 36
IS  - 5
SP  - 665
EP  - 674
KW  - 
UR  - https://doi.org/10.1071/PH830665 
N2  - The electron-hydrogen system is a true three-body system which provides an excellent test for theories of reactions in many-body systems that approximately involve only three-body degrees of freedom. The coupled-channels optical approximation reproduces experimental data in most cases within experimental error. The approximation may be extended to a larger space of coupled channels by various approximations which are tested with the example of 54·42 e V electron scattering on the Is, 2s and 2p space for hydrogen, extended by the addition of 3s and 3p channels. Channels outside this five-state space are treated by including the corresponding polarization potentials. 
ER  -

