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Many problems of numerically solving the Schrodinger equation require that we choose asymptoticdistances many times greater than the characteristic size of the region of interaction. The problems ofresonance diffraction for composite particles or the problem of nucleon scattering by nonspherical atomicnuclei are examples of the need to use a large spatial domain for calculations. If the solution to onedimensionalequations can be immediately chosen in a form that preserves unitarity, the invariance ofprobability (in the form of, e.g., fulfilling an optical theorem) is a real problem for two-dimensionalequations. An addition that does not exceed the discretization error and ensures a high degree of unitarityis proposed as a result of studying the properties of a discrete two-dimensional equation.The problem for scattering of rigid molecules by the disks was successfully solved using an improvedsampling scheme that provides the correct asymptotic behavior. Corresponding diffraction scatteringcurves are of a pronounced resonance nature.

Asymptotic behavior of numerical solutions of the Schrodinger equation