抄録
Polish layers of gold were examined by means of the transmission method of electron diffraction. Line breadths were measured at various stages of polishing. The mean grain size and the mean strain were determined using Hall’s method (Proc. Phys. Soc A 62 (1949), 741) for medium polish layers which produce broad ring patterns. The grain size was also determined from the electron micrograph and from the number of spots on a spotty diffraction ring obtained from a minute region of the specimen. The values obtained from those different methods agree in order of magnitude with each other.
Even at medium stages of polishing, the specimen is polished so heavily as to gain grain size 80 Å and strain 3.6%. The grain size rapidly decreases as polishing proceeds. At the final stage of polishing broad ring patterns change into the halo pattern composed of three haloes. The Bragg spacing corresponding to the most inner halo is 4.08 Å, agreeing with the results obtained by Nonaka and Kohra by the reflexion method (J. Phys. Soc. 9 (1954), 512).
