Enhanced Triplet Formation in Polycrystalline Tetracene Films by Femtosecond Optical-Pulse Shaping

被引：86
作者：
Grumstrup, Erik M. [1 ]
Johnson, Justin C. [2 ]
Damrauer, Niels H. [1 ]
机构：
[1] Univ Colorado, Dept Chem & Biochem, Boulder, CO 80309 USA
[2] Natl Renewable Energy Lab, Golden, CO 80401 USA
来源：
PHYSICAL REVIEW LETTERS | 2010年 / 105卷 / 25期
关键词：
SINGLET FISSION; SPECTROSCOPY; BACTERIORHODOPSIN; PENTACENE; MOLECULES; STATES;
D O I：
10.1103/PhysRevLett.105.257403
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Polycrystalline tetracene films have been explored using weak similar to 30 fs visible laser pulses that excite the lowest singlet exciton as well as coherent vibrational motion. Transient difference spectra show a triplet absorption which arises following singlet fission (SF) and persists for 1.6 ns without decay. Adaptive pulse shaping identifies multipulse optimal fields which maximize this absorption feature by similar to 20%. These are comprised of subpulses separated by time delays well correlated with the period of lattice vibrations suggesting such modes control the yield of SF photochemistry.
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页数：4
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