title: Donor's position-specific channel interference in substituted biphenyl molecules.
abstract: The channel interference mechanism describes the two-photon absorption process in terms of the relative orientations of different transition dipole moment vectors (TDMVs) in a molecule. Controlling these interferences is a difficult but important task, because it can provide new information about such absorption/emission processes. The present contribution aims to explain the reversal in the nature of these interferences with the relative positions of the donor-acceptor groups in substituted biphenyl molecules. The results obtained from the linear and quadratic response theories indicate that having the donor at the para position leads to a constructive interference whereas having it at any of the other two positions results in a destructive interference. This is explained by a systematic analysis of the relative orientations of all the TDMVs involved in a three-state model.
authors.affiliation: Laboratoire de Chimie Quantique, Institut de Chimie, CNRS/Université de Strasbourg, 1 rue Blaise Pascal, Strasbourg 67000, France. mehboob.cu@gmail.com.
authors.forename: Md
authors.initials: M
authors.lastname: Mehboob Alam