论文部分内容阅读
用奇异值分解和全局非线性拟合的方法处理全反式胡萝卜醛(all-trans-β-Apo-8’?carotenal)的飞秒时间分辨瞬态吸收光谱.以串行激发态弛豫动力学反应为模型,分别得到其在非极性溶剂正己烷和极性溶剂甲醇中的各个高激发态组分的吸收光谱和其各自的时间动力学特性,在正己烷中主要得到3个电子态能级,它们分别是S3(170fs),S2(2.32ps)和S1(26ps),而在甲醇中只得到两个能级,分别为S2(190fs)和S1(9.4ps).比较发现胡萝卜醛在甲醇中的瞬态吸收光谱红移,且S1态寿命变短,经分析认为是C==O基团的作用.同时表明SVD方法是处理飞秒时间分辨瞬态吸收光谱有效的工具.
The femtosecond time-resolved transient absorption spectra of all-trans-β-Apo-8 ’carotenal were treated by singular value decomposition and global non-linear fitting, The reaction model was used to obtain the absorption spectra and their respective time-dynamics characteristics of each highly excited state component in the non-polar solvent n-hexane and the polar solvent methanol respectively. Three main electronic states were obtained in n-hexane (170fs), S2 (2.32ps) and S1 (26ps) respectively, but only two energy levels were found in methanol, which were S2 (190fs) and S1 (9.4ps) respectively.Compared with that of carotenal The transient absorption spectra in methanol are red shifted and the lifetime of the S1 state is short, which is considered as the role of the C == O group.At the same time, the SVD method is an effective tool to deal with the femtosecond time-resolved transient absorption spectra.