Aderogba, Adebayo AbiodunChapwanya, MichaelDjoko, J.K. (Jules Kamdem)Lubuma, Jean M.-S.2015-09-152015-09-152016A.A. Aderogba, M. Chapwanya, J. Djoko Kamdem & J.M.-S. Lubuma (2016) Coupling finite volume and nonstandard finite difference schemes for a singularly perturbed Schrödinger equation, International Journal of Computer Mathematics, 93:11, 1833-1844, DOI: 10.1080/00207160.2015.1076569.0020-7160 (print)1029-0265 (online)10.1080/00207160.2015.1076569http://hdl.handle.net/2263/49857The Schrödinger equation is a model for many physical processes in quantum physics. It is a singularly perturbed differential equation where the presence of the small reduced Planck’s constant makes the classical numerical methods very costly and inefficient. We design two new schemes. The first scheme is the nonstandard finite volume method, whereby the perturbation term is approximated by nonstandard technique, the potential is approximated by its mean value on the cell and the complex dependent boundary conditions are handled by exact schemes. In the second scheme, the deficiency of classical schemes is corrected by the inner expansion in the boundary layer region. Numerical simulations supporting the performance of the schemes are presented.en© 2015 Taylor and Francis. This is an electronic version of an article published in International Journal of Computer Mathematics, vol. 93, no. 11, pp. 1833-1844, 2016, doi :1080/00207160.2015.1076569. International Journal of Computer Mathematics is available online at: http://www.tandfonline.com/loi/gcom2010.Schrödinger equationOscillatory preserving schemesFinite volume methodNonstandard finite difference methodPostprint Article