LOCATION OF THE LOW-ENERGY AG-1 STATE IN A POLYTHIOPHENE OLIGOMER BY 2-PHOTON ABSORPTION-SPECTROSCOPY - ALPHA-SEXITHIENYL

被引:97
作者
PERIASAMY, N [1 ]
DANIELI, R [1 ]
RUANI, G [1 ]
ZAMBONI, R [1 ]
TALIANI, C [1 ]
机构
[1] TATA INST FUNDAMENTAL RES, BOMBAY 400005, INDIA
关键词
D O I
10.1103/PhysRevLett.68.919
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The two-photon excitation spectrum in polycrystalline alpha-sexithienyl (T6) thin film has been investigated at 4.2 K in the spectral range between 910 and 1180 nm of the fundamental laser radiation. The intense two-photon absorption band at 18350 cm-1 is assigned to the 2(1)A(g) exciton band origin. The comparison of the one-photon and two-photon excitation spectra shows that the lowest "gerade" exciton level lies at 898 cm-1 above the lowest one-photon-allowed 1(1)B(u) exciton level.
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页码:919 / 922
页数:4
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