DMSO溶剂中All-trans-astaxanthin激发态的飞秒时间分辨光谱  

Femtosecond Time-resolved Spectroscopies of the Excited State of the All-trans-astaxanthin in DMSO Solvent

作　　者：蒋礼林[1] 刘伟龙[2] 陈勤[3] 石艳[1] 吴桂容[1] 

机构地区：[1]贺州学院教务处,广西贺州542899 [2]哈尔滨工业大学物理系,黑龙江哈尔滨150001 [3]贺州学院教育与音乐学院,广西贺州542899

出　　处：《光子学报》2017年第8期181-187,共7页Acta Photonica Sinica

基　　金：国家自然科学基金(No.11304058);广西自然科学基金(No.2014GXNSFAA118019);广西教育厅科研基金(No.ZD2014127);贺州学院博士启动基金(No.HZUBS201401)资助~~

摘　　要：基于飞秒时间分辨瞬态吸收和多元瞬态光栅光谱技术对全反式Astaxanthin(AXT)在DMSO溶剂中的超快激发态弛豫动力学进行了观测.结果表明,光激发后AXT/DMSO体系直接发生S_0→S_2跃迁,基态漂白对应光谱范围为420~550nm.由S_2→S_1的内转换过程发生的时间常数为120~160fs.S_1态激发态吸收对应的光谱范围为550~740nm,基态漂白恢复过程对应的是S_1→S_0的内转换过程,其时间尺度为4.50~5.50ps.The ultrafast excited state relaxation dynamics of all-trans-Astaxanthin（AXT）in Dimethyl Sulfoxide（DMSO）was investigated using femtosecond time-resolved transient absorption and multiplex transient grating spectroscopies.The results reveal that the S0→S2 absorption transition directly occurs in the AXT/DMSO system,which corresponds to the ground state bleach in the 420550nm spectral region.Internal conversion that is ascribed to S2→S1 transition takes place on the time constant of 120160fs.The excited state absorption of the S1 state corresponds to the region of the 550740nm.The recovery progress of the ground state bleach corresponds to the internal conversion progress,which is attributed to the S1→S0 transition and occurs on the time scale of 4.505.50 ps.

关 键 词：飞秒时间分辨 瞬态吸收 多元瞬态光栅 激发态弛豫动力学 内转移 时间常量 

分 类 号：O433.4[机械工程—光学工程] O644.12[理学—光学]