ICCAS OpenIR
Ultrafast internal conversion and vibrational relaxation in sing let excited-state all-trans-beta-carotene as revealed by femtosecond time-resolved stimulated Raman spectroscopy
Xiao-Hui, Zhao1,2,3; Fei, Ma1,3; Yi-Shi, Wu1,3; Xi-Cheng, Ai3; Jian-Ping, Zhang1,3
2008
Source PublicationACTA PHYSICA SINICA
ISSN1000-3290
Volume57Issue:1Pages:298-306
AbstractA femtosecond time-resolved stimulated Raman scattering (FSRS) apparatus was built, and was used to study the ultrafast internal conversion and vibrational relaxation processes between the singlet excited states of all-trans-beta- carotene in solution. The FSRS apparatus, constructed on the basis of a three-pulse pump-probe scheme, achieved a time resolution of 150 fs, a spectral resolution of 23.7 cm(-1), and a detection spectral window of 300-4000 cm(-1). The FSRS results are interpreted in terms of a serial internal-conversion scheme between the low-lying singlet excited states, i.e. S-2 --> S-X --> S-1 --> S-0. Spectral dynamics analysis and kinetics analysis proved that the intra-molecular vibrational relaxation in the S-1 state proceeds on a time scale of 0.3-0.6 ps, while the 'hot' S-1 state decays with a time constant similar to the lifetime of this state (similar to 11 ps). Furthermore, the time scale of intra-molecular vibrational relaxation and vibrational cooling processes in the S-0 state are shown to be similar to 0.3 and similar to 15 ps, respectively. These results are useful for a deeper insight into the light-harvesting function of carotenoids in photosynthetic organisms.
KeywordFemtosecond Time-resolved Raman Spectroscopy All-trans-beta-carotene Excited-state Internal Conversion Vibrational Relaxation
Indexed BySCI
Language英语
WOS IDWOS:000252344800049
PublisherCHINESE PHYSICAL SOC
Citation statistics
Cited Times:7[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/63274
Collection中国科学院化学研究所
Corresponding AuthorJian-Ping, Zhang
Affiliation1.Chinese Acad Sci, Inst Chem, BNLMS, State Key Lab Struct Chem Unstable & Stable Speci, Beijing 100080, Peoples R China
2.Hebei Univ, Coll Phys Sci & Technol, Baoding 071002, Peoples R China
3.Renmin Univ China, Dept Chem, Beijing 100872, Peoples R China
Recommended Citation
GB/T 7714
Xiao-Hui, Zhao,Fei, Ma,Yi-Shi, Wu,et al. Ultrafast internal conversion and vibrational relaxation in sing let excited-state all-trans-beta-carotene as revealed by femtosecond time-resolved stimulated Raman spectroscopy[J]. ACTA PHYSICA SINICA,2008,57(1):298-306.
APA Xiao-Hui, Zhao,Fei, Ma,Yi-Shi, Wu,Xi-Cheng, Ai,&Jian-Ping, Zhang.(2008).Ultrafast internal conversion and vibrational relaxation in sing let excited-state all-trans-beta-carotene as revealed by femtosecond time-resolved stimulated Raman spectroscopy.ACTA PHYSICA SINICA,57(1),298-306.
MLA Xiao-Hui, Zhao,et al."Ultrafast internal conversion and vibrational relaxation in sing let excited-state all-trans-beta-carotene as revealed by femtosecond time-resolved stimulated Raman spectroscopy".ACTA PHYSICA SINICA 57.1(2008):298-306.
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