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PERSYS–A program for the solution near the origin of coupled channel Schrödinger equation with singular potential. (English) Zbl 0993.65113
Summary: The code PERSYS produces the regular solution of a system of coupled Schrödinger equations near the origin, where the potential exhibits a singularity, due to the centrifugal, spin-orbit and Coulomb components. The solution is calculated by means of a highly accurate method, which consists of a perturbative technique in which the centrifugal term is taken as the reference potential while the rest of terms are seen as a perturbation.

65M70 Spectral, collocation and related methods for initial value and initial-boundary value problems involving PDEs
65Y15 Packaged methods for numerical algorithms
81Q05 Closed and approximate solutions to the Schrödinger, Dirac, Klein-Gordon and other equations of quantum mechanics
35Q40 PDEs in connection with quantum mechanics
Full Text: DOI
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