Abstract
The past few years have seen considerable advances in the experimental and theoretical study of positron - atom collisions. On the theoretical side these advances have been associated primarily with the development of coupled — state methods for positron collisions with one — electron atoms, i.e., with atomic hydrogen and, in a frozen core approximation, the alkali metals. For these systems there now exist computer programs capable of using large numbers of eigenstates and pseudostates. It is the achievements of this coupled — state approach to which we shall confine our attention here. However, in celebrating these recent successes, we would not wish to forget the earlier pioneering work of Wakid1,2, Ghosh3–20, McEachran and Stauffer21–30, and their collaborators, using this form of approximation. Invaluable to the coupled — state work has been the existence of good variational calculations at low energies31–54, especially those which go beyond the positronium formation threshold34,41–45,47,48,50,52–54. Last, but not least, the theory has profited enormously from the stimulation provided by experiment, particularly, in the present context, the experimental work of Charlton, Laricchia and co-workers at University College London, of Kauppila, Stein and co-workers at Detroit, and of Raith and co-workers at Bielefeld.
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M.T. McAlinden, A.A. Kernoghan and H.R.J. Walters, in preparation.
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Walters, H.R.J., Kernoghan, A.A., McAlinden, M.T., Campbell, C.P. (1997). Positron Collisions with Atoms. In: Burke, P.G., Joachain, C.J. (eds) Photon and Electron Collisions with Atoms and Molecules. Physics of Atoms and Molecules. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-5917-7_21
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