Effect of Impurity on Excitation Migration in a Linear Chain of Molecules

摘要

The effect of an impurity on the second moment of an exciton wave packet is studied in the case of a simple onehyphen;dinensional model of a molecular crystal with nearesthyphen;neighbor coupling. An expression is derived for the firsthyphen;order correction, in the sense of perturbation theory, to the second moment and numerical evaluation is made.