中文摘要：

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S0→S2跃迁,基态漂白对应光谱范围为420550nm.由S2→S1的内转换过程发生的时间常数为120160fs.S1态激发态吸收对应的光谱范围为550740nm,基态漂白恢复过程对应的是S1→S0的内转换过程,其时间尺度为4.505.50ps.

英文摘要：

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.