1955 年 24 巻 7 号 p. 283-287
The orientation of photolytic silver from silver bromide has been investigated by electron diffraction in succession to the previous work. Different surface states of photolytic silver are obtained by various means of photolysis. There are two kinds of orientation: one is that when the  direction of the greatest atomic density of silver lattice coincides with the  direction of silver bromide, which is the rectangular intersection of  and  planes of the bromide, and the other is that when the  direction of silver lattice coincides with the  direction of silver bromide lattice or the other way round giving the best correspondence of periodicity in the atomic rows. Parallel orientations and one of  on  orientations belong to the former and the rest three orientations to the latter. The former is observed on crystals made from melt or grown form solution when heated while the latter by photolysis with ultraviolet light or electron beam at lower temperatures in connection with the forbidden spots or intermediate crystals. In the latter case, the migra-tion of silver ions toward the irregularities may be unfavored, therefore the correspondence of atomic periodicities might play an important role in setting the orientation of photolytic silver. The former case suggests the trapping of silver ions at the  direction of irregularities of silver bromide crystals.