The Polarized Absorption Edge and the Davydov Splitting of Anthracene

概要

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The temperature dependence of the absorption edge of crystalline anthracene near 4000Å has been re-examined using the Glan-Thomson prism in the temperature range from 390 to 79°K. The long wave-length tail of the first absorption band and that of the absorption shoulder due to the vibrationally allowed transition are both represented by the Urbach rule: for the first absorption band δ_a'=1.73 and δ_b'=1.76; E_<0a>=3.168eV and E_<0b>=3.123eV. The absorption edge of the second absorption band near 2700Å is also studied, where the b component has an exponentially rising edge as if governed by the Urbach rule. The Davydov splitting is investigated on doped and undoped thin flakes, and the polarization ratio is measured on bulk crystals. The smaller splitting is discussed in connection with thermal libration of molecular axes or lattice distortion induced by the substituted tetracene molecules. In the pure crystal the first absorption peak is split by about 310cm^<-1> for 0°K.
社団法人日本物理学会の論文
1966-11-05