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Article Dans Une Revue Microporous and Mesoporous Materials Année : 2003

Interpretation of spectral broadening and clustering of a pyrene derivative adsorbed on silica gels

Résumé

This paper discusses a mechanism of broadening of the UV absorption spectra of an adsorbed species in a microporous material, with specific reference to a pyrene derivative adsorbed on silica gels [Lacombe et al. Micropororous Mesopororous Mater., 46 (2001) 311]. We show that broadening by resonance exchange interactions between clustered molecules explains the novel qualitative features of the data. The influences of pore size and adsorbate concentration are explored in a simple model of molecules adsorbed randomly on spherical pores. Absorption spectra are calculated from a tight binding Hamiltonian for the excited state, including inhomogeneous broadening and resonance exchange. Quantitative differences between the model and the experimental spectra show that spectral broadening is due to non-random clustering in the ground state of the adsorbate molecules. © 2003 Elsevier Science Inc. All rights reserved.

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hal-01582232 , version 1 (05-09-2017)

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Ross Brown, Sylvie Lacombe-Lhoste, Henri Cardy. Interpretation of spectral broadening and clustering of a pyrene derivative adsorbed on silica gels. Microporous and Mesoporous Materials, 2003, 59 (2-3), pp.93--103. ⟨10.1016/S1387-1811(03)00289-0⟩. ⟨hal-01582232⟩
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