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- W2037899322 abstract "Three-color three-laser photochemistry of di(p-methoxyphenyl)methyl chloride ((p-CH3OC6H4)2CHCl = An2CHCl) was studied by three-step excitation using 308-, 355-, and 495-nm lasers with delay times of 100 ns to 3 μs. Di(p-methoxyphenyl)methyl radical (An2CH•) was produced together with An2CH• in the excited state (An2CH•*) and di(p-methoxyphenyl)methyl cation (An2CH+) in quantum yields of 0.09, 0.12, and 0.12, respectively, after a laser flash during 308-nm laser (first laser) photolysis of An2CHCl in acetonitrile. Excitation of An2CH• with a 355-nm laser (second laser) resulted in formation of transient absorption of An2CH•* and An2CH+ and fluorescence of An2CH•* with a peak at 550 nm. The formation of An2CH+ from An2CH• requires two-photon energy at 355 nm and proceeds by resonant two-photon ionization (RETPI) of An2CH• through sequential excitation of An2CH•*. Excitation of An2CH+ with a 495-nm laser (third laser) produced fluorescence with a peak at 560 nm. Although the fluorescence of An2CH+ was also observed without the second laser excitation because of the initial formation of An2CH+ during the first 308-nm laser photolysis, the fluorescence intensity of An2CH+ increased approximately 1.2 times with the second 355-nm laser excitation of An2CH•. Therefore, the second laser excitation can perform the conversion of An2CH• to An2CH+ through RETPI within the laser flash duration, and the fluorescence intensity of An2CH+ can be controlled by the second irradiation." @default.
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- W2037899322 date "2003-05-24" @default.
- W2037899322 modified "2023-10-17" @default.
- W2037899322 title "Three-Color Three-Laser Photochemistry of Di(<i>p</i>-methoxyphenyl)methyl Chloride" @default.
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- W2037899322 doi "https://doi.org/10.1021/jp027002l" @default.
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