Author/Authors :
Liu، نويسنده , , Wei-Long and Zheng، نويسنده , , Zhi-Ren and Zhang، نويسنده , , Jianping and Wu، نويسنده , , Wenzhi and Li، نويسنده , , Aihua and Zhang، نويسنده , , Wei-Wei Huo، نويسنده , , Mingming and Liu، نويسنده , , Zhi-Guo and Zhu، نويسنده , , Rui-Bin and Zhao، نويسنده , , Lian-Cheng and Su، نويسنده , , Wen-Hui، نويسنده ,
Abstract :
We have performed a femtosecond time-resolved absorption spectroscopic experiment of β-carotene in n-hexane solution under high pressure up to ∼1.0 GPa. Using white-light continuum in the visible spectral region as probe light, we found that the energy level of S1 state descends, whereas its lifetime becomes longer with the rising pressure. We ascribe this tendency deviating from the energy gap law to the viscosity effects on the CC stretching vibrations, which is fully consistent with the microviscosity theory. This Letter may provide some insights on the light harvesting and photoprotection functions of carotenoids in photosynthetic organisms.
