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Type: Artigo de periódico
Title: Two-photon absorption spectrum in diazoaromatic compounds
Author: De Boni, L
Andrade, AA
Yamaki, SB
Misoguti, L
Zilio, SC
Atvars, TDZ
Mendonca, CR
Abstract: This Letter studies the degenerate two-photon absorption (2PA) spectra of three diazoaromatic compounds using Z-scan with fs-pulses. The 2PA spectra exhibit resonant enhancement of the nonlinearity as the excitation approaches the linear absorption. The absence of 2PA to the pi pi* band is related to the weaker donor/acceptor groups, and lower symmetry of diazoaromatic compounds, in agreement with our semi-empirical calculations. The higher magnitude of the 2PA cross-section, in comparison with single azoaromatics, demonstrates the positive effect of increasing conjugation. The decrease of 2PA cross-section with temperature is attributed to thermally induced torsions, which decreases the effective conjugation of diazoaromatic molecules. (C) 2008 Elsevier B.V. All rights reserved.
Country: Holanda
Editor: Elsevier Science Bv
Citation: Chemical Physics Letters. Elsevier Science Bv, v. 463, n. 41794, n. 360, n. 363, 2008.
Rights: fechado
Identifier DOI: 10.1016/j.cplett.2008.08.063
Date Issue: 2008
Appears in Collections:Unicamp - Artigos e Outros Documentos

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