Ultrafast excited state relaxation in long-chain polyenes

被引：40

作者：

Antognazza, Maria Rosa ^{[1
]}

Lueer, Larry ^{[2
]}

Polli, Dario ^{[2
]}

Christensen, Ronald L. ^{[3
]}

Schrock, Richard R. ^{[4
]}

Lanzani, Guglielmo ^{[1
,2
]}

Cerullo, Giulio ^{[2
]}

机构：

[1] IIT PoliMI, Ctr Nano Sci & Technol, I-20133 Milan, Italy

[2] Politecn Milan, Natl Lab Ultrafast & Ultraintense Opt Sci, CNR INFM, Dipartimento Fis, I-20133 Milan, Italy

[3] Bowdoin Coll, Dept Chem, Brunswick, ME 04011 USA

[4] MIT, Dept Chem, Cambridge, MA 02139 USA

来源：

CHEMICAL PHYSICS | 2010年 / 373卷 / 1-2期

关键词：

Polyenes; Carotenoids; Ultrafast spectroscopy; Triplet states; BACTERIOCHLOROPHYLL ENERGY-TRANSFER; BETA-CAROTENE; ELECTRONIC EXCITATIONS; INTERNAL-CONVERSION; ALL-TRANS; GAP LAW; DYNAMICS; SPECTROSCOPY; FLUORESCENCE; ABSORPTION;

D O I：

10.1016/j.chemphys.2010.03.002

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We present a comprehensive study, by femtosecond pump-probe spectroscopy, of excited state dynamics in a polyene that approaches the infinite chain limit. By excitation with sub-10-fs pulses resonant with the 0-0 S-0 -> S-2 transition, we observe rapid loss of stimulated emission from the bright excited state S-2, followed by population of the hot S-1 state within 150 fs. Vibrational cooling of S-1 takes place within 500 fs and is followed by decay back to S-0 with 1 ps time constant. By excitation with excess vibrational energy we also observe the ultrafast formation of a long-living absorption, that is assigned to the triplet state generated by singlet fission. (C) 2010 Elsevier B. V. All rights reserved.

引用

页码：115 / 121

页数：7

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