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Manuscript Title: A program for calculating elastic scattering phase shifts for an electron colliding with a one-electron target using perturbation theory.
Authors: E. McGreevy, A.L. Stewart
Program title: LAG 1
Catalogue identifier: ACYD_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 14(1978)99
Programming language: Fortran.
Computer: ICL 1906S.
Operating system: GEORGE 4 (BOSS).
RAM: 96K words
Word size: 24
Keywords: Atomic physics, Scattering, Coupled differential Equation, Hartree-fock, Long range potential, Perturbation, Phase shift, Slater-type orbital, Wbk, One-electron atom, Electron, Frozen-core.
Classification: 2.4.

Nature of problem:
In calculating elastic scattering phase shifts in electron-atom scattering it is important to take adequate account of the correlation between the colliding electron and the target electrons which is not included in the static-exchange approximation. This can be achieved using perturbation theory.

Solution method:
Perturbation theory based on the frozen-core Hartree-Fock approximation in zero-order is used to calculate corrections to the F.C.H.F. phase shifts.

Running time:
The main factors controlling the running time are the number of exponent values being considered for the particular collision energy and the size of the Q-space wave function representation. Generally 100 seconds should be allowed for each value of the exponent.