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Exponentially-fitted Störmer/Verlet methods

Exponentially-fitted Störmer/Verlet methods

Guido Vanden Berghe
Abstract
Exponentially-fitted Stormer/Verlet methods are constructed taking into account a six-step flow chart. It is shown that the thus constructed methods, when applied to strongly oscillating problems, are equivalent respectively to Cautschi and Deulfhard methods. As an illustration the constructed algorithms are used to solve bounded states as well as resonance states of Schrodinger equations. It is seen that all the versions are of order four but the way the error on the eigenvalues increases with the energy differs from one version to the other for the two problems considered.

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