A perturbative approach to the coupled outer-region equations for the electron-impact excitation of neutral atoms
- 18 November 1999
- journal article
- Published by IOP Publishing in Journal of Physics B: Atomic, Molecular and Optical Physics
- Vol. 32 (23) , 5583-5591
- https://doi.org/10.1088/0953-4075/32/23/312
Abstract
We describe a perturbative approach to the solution of the coupled outer-region equations for the electron-impact excitation of neutral atoms, and which we have implemented within the computer code STGF. We compare the results from STGF for neutral Be and H with those that we have obtained with the non-perturbative R-matrix propagator code FARM. The excellent agreement obtained in general here points the way to the future extension of related codes for the calculation of energy levels and radiative rates in negative ions, photo-detachment cross sections and free-free electron transition data in the presence of a neutral atom.Keywords
This publication has 10 references indexed in Scilit:
- Farm — A flexible asymptotic R-matrix packageComputer Physics Communications, 1995
- Atomic data for opacity calculations. II. Computational methodsJournal of Physics B: Atomic and Molecular Physics, 1987
- Use of the R matrix method for bound-state calculations. I. General theoryJournal of Physics B: Atomic and Molecular Physics, 1985
- Integrals involving products of Coulomb functions and inverse powers of the radial coordinateJournal of Physics B: Atomic and Molecular Physics, 1984
- Quantum defect theoryReports on Progress in Physics, 1983
- Coulomb functions analytic in the energyComputer Physics Communications, 1982
- The Determination of Phases and Amplitudes of Wave FunctionsProceedings of the Physical Society, 1963
- Low-Energy Expansion of Scattering Phase Shifts for Long-Range PotentialsJournal of Mathematical Physics, 1963
- Modification of Effective-Range Theory in the Presence of a Long-Range (r−4) PotentialJournal of Mathematical Physics, 1961
- Strong Coupling in Optically Allowed Atomic Transitions produced by Electron ImpactProceedings of the Physical Society, 1961