On the effects of diagonal dipole matrix elements in multi-photon resonance profiles using two-level systems as models

Solutions of the time-dependent Schrödinger equation, in the semi-classical electric dipole approximation, are developed for the interaction of a two-level system, possessing both transition and diagonal dipole matrix elements, with applied static and sinusoidal electric fields. Exact solutions can only be obtained subject to conditions involving the orientations and strengths of the applied fields. These, and perturbative extensions, are used to discuss some of the features of multi-photon processes that depend on the existence of non-zero diagonal dipole matrix elements. Some of the results apply, in the limit of vanishing permanent moments, to the atomic two-level problem. This research was supported by grants from the Natural Sciences and Engineering Research Council of Canada and the Science and Engineering Research Council of the United Kingdom. This research was supported by grants from the Natural Sciences and Engineering Research Council of Canada and the Science and Engineering Research Council of the United Kingdom. Notes This research was supported by grants from the Natural Sciences and Engineering Research Council of Canada and the Science and Engineering Research Council of the United Kingdom. Additional informationNotes on contributorsEdwin A. Power Associated with the Centre for Interdisciplinary Studies in Chemical Physics, University of Western Ontario.