Two-photon absorption properties of symmetric substituted diacetylene: drastic enhancement of the cross section near the one-photon absorption peak

Autor:	Kenji Kamada, Koji Ohta, Koichi Kondo, Yoichiro Iwase
Rok vydání:	2003
Předmět:	Photon Diacetylene Absorption spectroscopy General Physics and Astronomy Resonance Photochemistry Two-photon absorption Molecular physics Spectral line chemistry.chemical_compound Wavelength chemistry Physical and Theoretical Chemistry Absorption (electromagnetic radiation)
Zdroj:	Chemical Physics Letters. 372:386-393
ISSN:	0009-2614
DOI:	10.1016/s0009-2614(03)00413-5
Popis:	Two-photon absorption (TPA) spectra are presented for newly synthesized bis(pyridylstyryl)-substituted diacetylene and related methyl triflate derivatives. The TPA cross section of a derivative (MPPBT) was found to increase drastically with decreasing the incident wavelength below 650 nm and to reach (2.42±0.46)×10 −47 cm 4 s molecule −1 photon −1 at 571 nm, in addition to the weaker, lowest energy TPA peak centered at 764 nm. A four-state model was needed to account for the observed spectral shape, suggesting that the drastic enhancement is due to one-photon resonance enhancement not only of the lowest energy TPA transition but also of a higher energy two-photon transition.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::879645356ac3b7c1aad10422f59a83ef https://doi.org/10.1016/s0009-2614(03)00413-5 Zobrazit plný text záznamu Full Text from ScienceDirect