Azcárraga, José A. deNavarro Veguillas, Luis2012-04-262012-04-2619750022-2488https://hdl.handle.net/2445/24505A new spinning axis representation is introduced. It allows us to calculate the evolution operator of a system with slowly varying time dependent Hamiltonian with the desired degree of approximation in the parameter used for describing its dynamical evolution. The procedure is compared with a previously existing one and applied to a simple example.4 p.application/pdfeng(c) American Institute of Physics, 1975Teoria quànticaEquació de SchrödingerQuantum theorySchrödinger equationinfo:eu-repo/semantics/article910info:eu-repo/semantics/openAccess