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crystals, no such splitting could be detected. If present, the splitting must not be greater than 5 cm-' in the trichlorobenzene and hexachlorobenzene and 3 cm-' in the durene crystal. In the case of the hexachlorobenzene crystal, the energy of separation between the two K=0 levels in the exciton band has been calcu- lated to be 0.7 cm-'. Thus it appears that at least one of the low-lying excited elec- tronic states of the pyrene crystal has the nature of exciton states, though in the case of the 1,3,5-trichlorobenzene, hexachloroben- zene, and durene crystals any such conclusion would be too hasty in view of the paucity of experimental data. Phiotoconductivity of organic crystals (Sec. 6). -In a recent paper"12 Northrop and Simpson have published values of photo- currents of pure hydrocarbon crystals. They observed that the impurity molecules embedded in pure crystals which quench the fluorescence of pure substance reduce the photocurrent in the same ratio. Their other observations regarding dependence of photo- current with light intensity, applied voltage, etc., are in agreement with previous publications. From these observations they propose that the interaction of two excitons is required to produce a single ionized molecule. Thus the production
Reviews of Modern Physics – American Physical Society (APS)
Published: Oct 1, 1959
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