A Quantitative Theory Model of a Photobleaching Mechanism

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2003,（11）
• 页码范围: 1940-1943
• 页数: 4页
• 语种: 英文

摘要

A photobleaching model:D-P(dye-photon interaction)and D-O(Dye-oxygen oxidative reaction)photobleaching theory,is proposed.The quantitative power dependences of photobleaching rates with both one-and two-photon excitations(1 PE and TPE)are obtained.This photobleaching model can be used to elucidate our and other experimental results commendably.Experimental studies of the photobleaching rates for rhodamine B with TPE under unsaturation conditions reveals that the power dependences of photobleaching rates increase with the increasing dye concentration,and that the photobleaching rate of a single molecule increases in the second power of the excitation intensity,which is different from the high-order(＞ 3)nonlinear dependence of ensemble molecules.