Photon energy upconversion in porphyrins: one-photon hot-band absorption versus two-photon absorption

Drobizhev, M.; Karotki, A.; Kruk, M.; Krivokapic, A.; Anderson, H. L.; Rebane, A. (2003). Photon energy upconversion in porphyrins: one-photon hot-band absorption versus two-photon absorption. Chem. Phys. Lett., 370, 690-699.
ajakirjaartikkel
Drobizhev, M.; Karotki, A.; Kruk, M.; Krivokapic, A.; Anderson, H. L.; Rebane, A.
Chem. Phys. Lett.
0009-2614
370
2003
690-699
Ilmunud
1.1. Teadusartiklid, mis on kajastatud Web of Science andmebaasides Science Citation Index Expanded, Social Sciences Citation Index, Arts & Humanities Citation Index ja/või andmebaasis Scopus (v.a. kogumikud)
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English, We study the porphyrin S-1 -- > S-0 fluorescence and the photosensitized singlet oxygen (1)Delta(g) -- > (3)Sigma(g) phosphorescence, both originating from absorption of photons with energy less than the porphyrin S-0 --> S-1 transition energy. By measuring the excitation intensity dependence of fluorescence at lowered sample temperatures, we are able to discriminate between two parallel processes of one-photon hot-band absorption (HBA) and simultaneous two-photon absorption (TPA). When the HBA and TPA contributions are comparable in magnitude, we use this new method to determine absolute TPA cross-section. We also demonstrate for the first time a singlet oxygen photo sensitization via HBA in porphyrin. (C) 2003 Elsevier Science B.V. All rights reserved.
DISULFONATED ALUMINUM PHTHALOCYANINE; TUMOR-BEARING MICE; PHOTODYNAMIC