Drastic enhancement of two-photon absorption in porphyrins associated with symmetrical electron-accepting substitution

Drobizhev, M.; Karotki, A.; Kruk, M.; Mamardashvili, N. Z.; Rebane, A. (2002). Drastic enhancement of two-photon absorption in porphyrins associated with symmetrical electron-accepting substitution. Chem. Phys. Lett., 361, 504-512.
ajakirjaartikkel
Drobizhev, M.; Karotki, A.; Kruk, M.; Mamardashvili, N. Z.; Rebane, A.
Chem. Phys. Lett.
0009-2614
361
2002
504-512
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 observe a dramatic enhancement of simultaneous two-photon absorption (TPA) in a series of substituted tetraazaporphyrins with multiple electron-accepting groups and show for the first time that the TPA cross-section increases in linear proportion with the substituent's Hammett constant. The measured cross-section amounts to sigma(2) = 1.6 x 10(-47) cm(4) s/photon for octakis(4-nitrophenyl)-tetraazaporphine at 770 nm. This large value is explained by both the resonance enhancement by a strong Q(x)(0-0) linear transition and the presence in the same spectral region of a strong two-photon allowed gerade-gerade transition. (C) 2002 Elsevier Science B.V. All rights reserved.
2-PHOTON ABSORPTION; OPTICAL-PROPERTIES; CROSS-SECTIONS; MOLECULES;