双光子光化学.ppt

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1、激光化学与双光子光化学激光化学与双光子光化学樊美公2011激光激光(线性线性)化学化学同步双光子（非线性）光化学同步双光子（非线性）光化学分步双光子（分步双激光）光化学分步双光子（分步双激光）光化学 双分子双光子光化学双分子双光子光化学激光化学与双光子光化学激光化学与双光子光化学同步双光子同步双光子同步双光子吸收机理同步双光子吸收机理同步双光子技术特征同步双光子技术特征Z-扫描结果扫描结果分步双光子光化学1989，Renzepis飞秒分步双光子光化学飞秒分步双光子光化学设备示例设备示例Photochromism of fulgideTransmission and Absorption spe

2、ctra of two-photochromic processPotential energy curve diagram分步双光子（分步双激光）光化学分步双光子（分步双激光）光化学螺螺噁嗪的光致变色机理噁嗪的光致变色机理Studies on Photochromic Mechanism ofSpirooxazines byTwo-step two-laser method设计新化合物确证反应机理设计新化合物确证反应机理Photochemistry and Photophysics of Benzophenone and Carbonyl compounds二苯酮的光物理过程二苯酮的光物理过

3、程Transient absorption spectra of BenzophenoneExcitation at 335nmDifferent excited states formation monitored at 530nm during ultrafast pump-probe excited at 267nmDifferent excited states formation monitored at 530nm during ultrafast pump-probe excited at 335nm Formation of the S2 state monitored at

4、580nm during ultrafast pump-probe at 267nmNorrish Type II ReactionsComplexity of Norrish Type II ReactionMechanism of Norrish Type II ReactionApplication of Norrish Type II reactionPhotochemistry of IntermediateTwo-laser two-photo induced reactionsTwo-step two laser photolysis ofBromonaphalene and B

5、romoanthraceneTwolaser photolysis of 2,2,6,6-tetramethylcyclohezenoneFluorescence of free radical(Photochemical intermediate)Absorption spectra of free radicalReactions of free radical双分子双光子光化学双分子双光子光化学 Thank you very much indeed for your attention1P(excitation wavelength 375,371,400 and 355nm for 1,2,3,and 4)and 2P fluorescence(736 for 1,2,3,800nm for 4),1 and 2 are 10 times expandedPhotophysics properties of 1,2,3,and 4Absorption spectra of spiropyran and its photochromic product Fluorescence of B,excitation with 2P 800nm.Decay of photoluminescence(PL)of B,excitation 532nm.