LEED, AES and thermal desorption study of iodine chemisorption on the silver (100), (111) and (110) faces

Abstract

The chemisorption of iodine vapor on the three low index faces of silver single crystals has been studied by combined LEED, AES and thermal desorption mass spectrometry. By exposure to gaseous iodine, only a c(2 × 2) phase is found on Ag(100), while on Ag(111) and Ag(110) several structures are observed depending on the iodine coverage. On all the three faces, the saturation coverage is about the same. Further iodine uptake leads to the formation of a thin layer of epitactic silver iodide, which, upon heating, undergoes structural changes before desorption.