Angle resolved ultraviolet photoelectron spectroscopy study of ultrathin iron films on Si(111) surfaces

Ultrathin iron films deposited on Si(111) 7×7 surfaces were investigated by low‐energy electron diffraction–Auger electron spectroscopy (LEED–AES) and angle resolved ultraviolet photoelectron spectroscopy (ARUPS). On Si(111)7×7 surfaces, iron film grew layer by layer and formed an Fe(111) epitaxial film. At about the stage of monoatomic layer, the LEED pattern changed from 1×1 to 2×2 superstructure owing to annealing above 400 °C. At the same time a shift of Fe d‐band peak to the higher binding energy side by 1.2 eV was observed by means of ARUPS measurements. It was also found that the peak intensity peculiar to 2×2 structure was sensitive to the angle of incident light as well as to the direction of emission.