Photon absorption and scattering in Fano anti-resonances

Abraham Nitzan*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


The Green’s function method is utilized to obtain a modified treatment of Fano’s line-shape problem which takes into account the coupling between different states in the continuous (or quasi-continuous) non-radiative manifold due to their interaction with the same radiation field states. A new expression for the absorption line-shape is obtained in the form σa(ϵ)∞ [(ϵ + qYL)2 + (YLq2 + 1)(1 – YL)]/(ϵ2 + 1), where e is the reduced energy parameter, ϵ is Fano’s line-shape index and YL is the non-radiative quantum yield obtained when the non-radiative manifold is optically forbidden. As YL is always smaller than unity, the absorption never strictly vanishes in contrast to the result obtained in Fano’s approximation. In addition, expressions are obtained for the emission line-shape and for the (energy dependent) emission quantum yield within a Fano resonance. The quantum yield so obtained is free from the singular behaviour which characterizes the same quantity obtained in Fano’s approximation.

Original languageEnglish
Pages (from-to)65-80
Number of pages16
JournalMolecular Physics
Issue number1
StatePublished - Jan 1974
Externally publishedYes


FundersFunder number
National Science Foundation
Office of Naval Research


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