Anomalous inhomogeneous broadening of electronic spectra and conformational states of charge transfer molecules

V. I. Tomin

doi:10.1117/12.629476

1 June 2005 Anomalous inhomogeneous broadening of electronic spectra and conformational states of charge transfer molecules

V. I. Tomin

Author Affiliations +

Proceedings Volume 5849, Fifth Workshop on Atomic and Molecular Physics; (2005) https://doi.org/10.1117/12.629476
Event: Fifth Workshop on Atomic and Molecular Physics, 2004, Jurata, Poland

Abstract

The excited electronic states with internal charge transfer of some molecules show an anomalously strong inhomogeneous broadening of their electronic spectra. The paper presents the results obtained by studying spectral inhomogeneity of the electronic bands of an archetype molecule with intramolecular charge transfer in the excited state dimethylaminobenzonithrile (DMABN) in polar solvents. The inhomogeneity manifests itself in both luminescence and luminescence excitation spectra. The broadening is anomalously large and amounts to 140-150 nm. The interpretation of the obtained results is based on treating a solution as a set of chemically identical solvates with luminophor molecule in the centre which have different energies of the pure electronic transitions. The inhomogeneity arises due to both the intermolecular effect of luminophor environment on its spectra in polar solvents and the existence of various conformers of DMABN. Some of these conformers possess absorption and emission spectra well shifted to the red edge of the spectra and could be selectively excited in the far Antistokes region. The results of kinetic and polarization study of DMABN luminescence at such excitation by picosecond semiconductor laser radiation at 403 nm are presented.

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V. I. Tomin "Anomalous inhomogeneous broadening of electronic spectra and conformational states of charge transfer molecules", Proc. SPIE 5849, Fifth Workshop on Atomic and Molecular Physics, (1 June 2005); https://doi.org/10.1117/12.629476

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