Acta Photonica Sinica, Volume. 46, Issue 8, 832002(2017)
Femtosecond Time-resolved Spectroscopies of the Excited State of the All-trans-astaxanthin in DMSO Solvent
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 420~550 nm spectral region. Internal conversion that is ascribed to S2→S1 transition takes place on the time constant of 120~160 fs. The excited state absorption of the S1 state corresponds to the region of the 550~740 nm. 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 4.50~5.50 ps.
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JIANG Li-lin, LIU Wei-long, CHEN Qin, SHI Yan, WU Gui-rong. Femtosecond Time-resolved Spectroscopies of the Excited State of the All-trans-astaxanthin in DMSO Solvent[J]. Acta Photonica Sinica, 2017, 46(8): 832002
Received: Mar. 17, 2017
Accepted: --
Published Online: Oct. 30, 2017
The Author Email: Li-lin JIANG (jianglilin2009@gmail.com)