Single crystals of ZnS, ZnSe, CdTe, CdS, and epitaxial ZnSe/ZnS are irradiated with a 100 keV electron beam and observed in a conventional transmission electron microscope. The electron beam induced damage observed may be explained in terms of the formation and interaction of point defects arising from the action of a sub‐threshold ionization mechanism. Experimental observations are compared with theoretical predictions with consideration being given to the extent of electron beam heating within the samples. The susceptibility to damage from electron beam irradiation is found to vary in order ZnS > CdS > ZnSe > CdTe.

Temperature and day length were shown to affect, to a major and minor degree respectively, the expression of male sterility in G. hirsutum stocks carrying G. anomalum or G. arboreum cytoplasms. Generally, sterility increased with increasing temperature and day length. Day temperatures above 33°C were required for the consistent expression of male sterility in the sterile A lines tested, while the maintainer, or B, lines became completely sterile at day temperatures above 36�. It was concluded that while the production of hybrid cotton seed by means of the sterile A lines currently available may be feasible in some tropical areas of Australia, it would be desirable to develop genotypes in which the cytoplasmic male sterile character is stable under a much wider set of temperature regimes.

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Abstract-Considerable interest is given to the excellent scintillation properties of cerium doped lanthanum chloride (LaCl 3 ) and lanthanum bromide (LaBr 3 ). The scintillation efficiencies are much greater than other materials, even those containing cerium. This high efficiency is attributed to the high mobility of electrons and holes, unique placement of the cerium 5d states within the band gap, and energy of the band gap.To better understand the scintillation process and better define the nature of the Self Trapped Exciton (STE) within these unique scintillation materials, density functional theory (