Investigation of GeS (001)

Various possibilities of the preparation of the clean GeS surface were studied. The LEED pattern of the (001) face of the GeS cleaved in situ exhibits clear ordinary reflections. The dimensions of the surface unit mesh agree well to within experimental error (6%) with the corresponding dimensions of the bulk unit cell.The author wishes to thank Dr M.imeková for performing scanning electron microscopy pictures and Dr K.Jurek CSc. for EDAX measurements. Special thanks go to Dr M.Závtová who called my attention to this interesting material.