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Infrared Absorption Characteristics of Large-Sized Spherical Aryl-Ether Dendrimers.

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Title: Infrared Absorption Characteristics of Large-Sized Spherical Aryl-Ether Dendrimers.
Authors: WAKABAYASHI, Yuki Browse this author
TOKESHI, Manabu Browse this author →KAKEN DB
HIBARA, Akihide Browse this author
JIANG, Dong-Lin Browse this author
AIDA, Takuzo Browse this author
KITAMORI, Takehiko Browse this author
Keywords: L5AZO
Issue Date: Dec-2000
Publisher: 日本分析化学会
Journal Title: Analytical Sciences
Volume: 16
Issue: 12
Start Page: 1323
End Page: 1326
Publisher DOI: 10.2116/analsci.16.1323
Abstract: A specially designed experimental setup including a newly constructed KBr cell, a light source, a monochromator and an IR detection system suitable for strictly calibrated IR absorption measurements was constructed in order to elucidate strange phenomenon associated with cis-trans photo-isomerization at 6.26 µm of the azobenzene core located at the center of an aryl-ether dendrimer (L5AZO). The setup used an ordinary Nichrome source to measure the photon flux, irradiation area, and photon absorption rate as exactly as possible. The photon absorption rate was obtained as 1.2×10-3 photons/s·molecule and the absorption cross section of L5AZO molecules was estimated to be 3.1×10-19 cm2/molecule. Since these values of the absorption rate and absorption cross section are not abnormal, the occurrence of a simultaneous five-photon absorption is almost impossible. Therefore, the five-photon absorption and photo-isomerization shown by L5AZO suggested that the multiphoton process was not simultaneous absorption, but possibly a sequential absorption and energy storage until the equivalent energy of isomerization was reached.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 渡慶次 学

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