No abstract

The MAX IV facility is a planned successor of the existing MAX facility. The planned facility is described below. It consists of two new synchrotron storage rings operated at different electron energies to cover a broad spectral region and one linac injector. The linac injector is also meant to be operated as a FEL electron source. The two rings have similar low emittance lattices and are placed on top of each other to save space. A third UV light source, MAX III, is planned to be transferred to the new facility.

No abstract

The Wigner–Eisenbud R-matrix theory is applied to molecular collisions. Previous attempts required a Buttle correction to accelerate slow convergence. The present theory makes use of radial basis functions which satisfy arbitrary conditions at the R-matrix boundary. At the same time within the boundary, the basis functions are eigenfunctions of a realistic effective radial Hamiltonian. Consequently, the radial basis set is slightly nonorthogonal. It is shown that this is sufficient to afford a rapidly convergent expansion which remains reliable both in the neighborhood of and far from resonances. The Buttle correction is no longer needed. The method is applied to a problem of collinear collisions between an atom and a diatomic molecule. Results are in excellent agreement with previous calculations.

No abstract