The theory and experiment of solute migration caused by excited state absorptions  

作　　者：金肖 王玉晓 税敏 李常伟 杨俊义 张学如 杨昆 宋瑛林 

机构地区：[1]Department of Physics,Soochow University [2]Department of Physics,Harbin Institute of Technology

出　　处：《Chinese Physics B》2010年第1期382-387,共6页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant No. 10104007);the Program for New Century Excellent Talents in University, China (Grant No. NCET-04-0333);the Excellent Youth Fund of Heilongjiang Province,China (Grant No. JC-04-04)

摘　　要：Nonsymmetrical transition from reverse-saturable absorption （RSA） to saturable absorption （SA） caused by excited state absorption induced mass transport of the CuPcTs dissolved in dimethyl sulfoxide is observed in an open aperture Z-scan experiment with a 21-ps laser pulse. The nonsymmetrical transition from RSA to SA is ascribed neither to saturation of excited state absorption nor to thermal induced mass transport, the so-called Sorer effect. In our consideration, strong nonlinear absorption causes the rapid accumulation of the non-uniform kinetic energy of the solute molecules. The non-uniform kinetic field in turn causes the migration of the solute molecules. Additionally, an energy-gradient-induced mass transport theory is presented to interpret the experimental results, and the theoretical calculations are also taken to fit our experimental results.Nonsymmetrical transition from reverse-saturable absorption （RSA） to saturable absorption （SA） caused by excited state absorption induced mass transport of the CuPcTs dissolved in dimethyl sulfoxide is observed in an open aperture Z-scan experiment with a 21-ps laser pulse. The nonsymmetrical transition from RSA to SA is ascribed neither to saturation of excited state absorption nor to thermal induced mass transport, the so-called Sorer effect. In our consideration, strong nonlinear absorption causes the rapid accumulation of the non-uniform kinetic energy of the solute molecules. The non-uniform kinetic field in turn causes the migration of the solute molecules. Additionally, an energy-gradient-induced mass transport theory is presented to interpret the experimental results, and the theoretical calculations are also taken to fit our experimental results.

关 键 词：solute migration excited state absorption energy-gradient 

分 类 号：O561[理学—原子与分子物理]