Bombardment with 5 KeV Argon lons KatsuzoOKADA KoichiKASAI synOPSIs Etch・d p・tterns p・・duced in(111)・(100)・・pPer si・gle cryst・1・a・d・・pP・・p・lycryst・ls by bombardment with 5 KeV argon ions, were observed by electron microscopy by rep1ica methods. The results obtained are as follows; 1) In spite of the same crystallographic direction of the incident beams, etched patterns vary depending on the orientation of the surface of the single crystals. 2)When comparing etched patterns produced in

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... ls with those in single crystals, 1t Inay be possible to determine the orientation of each crystal grain in polycrystals.