Abstract
Local lattice relaxation about an excited molecule leads to the appearance of vibrational fine structure in the electronic absorption spectrum. To study the linewidth of the very sharp zero phonon line two types of coupling of the electron to the lattice are considered. A strong coupling, which causes the lattice relaxation and a weaker coupling of the lattice to the excition transfer matrix element. The latter one leads to phonon scattering processes within the exciton band and becomes important for the linewidth at low temperatures. It can be seen that the strong coupling tends to narrow the linewidth produced by the weak coupling mechanism. The analogy to motional narrowing as known from magnetic resonance can be drawn.
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