By P. G. Burke, W. Eissner (auth.), P. G. Burke, W. B. Eissner, D. G. Hummer, I. C. Percival (eds.)

It is difficult to understand yet however actual that Michael John Seaton, identified the world over for the keenness and talent with which he pursues his study in atomic physics and astrophysics, may be sixty years previous at the sixteenth of January 1983. To mark this get together a few of his colleagues and previous scholars have ready this quantity. It comprises articles that de­ scribe many of the issues that experience attracted his cognizance due to the fact he first began his learn paintings at collage university London such a lot of years in the past. Seaton's organization with collage collage London has now stretched over a interval of a few 37 years, first as an undergraduate pupil, then as a learn pupil, after which, successively, as Assistant Lecturer, Lecturer, Reader, and Professor. Seaton arrived at college university London in 1946 to develop into an undergraduate within the Physics division, having simply left the Royal Air strength during which he had served as a navigator within the Pathfinder strength of Bomber Command. there are various tales of the way his ability with tools and the precision of his calcula­ tions, later to be so obtrusive in his learn, kept his team from enemy motion, and on one social gathering, on a flight in the course of the Alps, from a collision with Mount Blanc that on the time was once shrouded in clouds.

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89) J Projecting this equation onto the channel functions 4>;, assuming that i' is defined by Eq. (3), and evaluating it at r = a yields immediately Eq. (83) where the R matrix is given by (90) and we have introduced the surface amplitudes W;k( a) = ~ vj ( a)aijk . (91 ) j A major fraction of the computer time goes into calculating the matrix elements involved in Eq. (88) and carrying out the diagonalization. However, this needs to be carried out only once to determine the R matrix for all low energies.

12). The functions wOi(r) and wli(r) are cut off at the origin so that they satisfy the correct boundary conditions there. If Coulomb potentials, or certain other long-range potentials, are present, such that analytical solutions can be found, these can be used instead of wOi(r) and w 1i (r) defined by Eq. (96) in the asymptotic region. In practice, for numerical convenience, these functions are also chosen to be orthogonal to the target and pseudo-orbitals Pn/(r) with the same angular symmetry.

4. Matrix Variational Method The Hulthen and Kohn(87,88) variational methods were first used by Massey and Moiseiwitsch(141) in electron-atom scattering to solve the static exchange equations for e- H scattering obtained when just the ground state is retained in Eq. (3). Later Schwartz(142,143) showed how the Kohn variation method could be used to obtain almost exact results in the elastic scattering region, for e-H scattering. He also pointed out difficulties that arise from certain anomalous singularities in the method.

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