期刊
JOURNAL OF PHYSICAL CHEMISTRY B
卷 109, 期 1, 页码 2-5出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp045652e
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A strong enhancement of the two-photon absorption (TPA) cross section of tetrakis(4-sulfonatophenyl)porphyrin diacid (H4TPPS2-) at various wavelengths when a J-type aggregate is formed in water with respect to the one observed for the H4TPPS2- monomer in a mixture of water, dimethyl sulfoxide (DMSO), and urea is presented. The TPA properties are characterized by the open aperture Z-scan technique and the ultrafast two-photon absorption spectroscopy with white light continuum probe (TPA-WLCP) technique. The observed enhancement is discussed in terms of possible electronic cooperative effects in the aggregate.
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