Growth modes and surface structures of Te overlayers deposited on Au 111/surfaces

The growth modes and surface structures of Te overlayers deposited on Au 111.surfaces have been studied by Auger electron spectroscopy AES., low energy electron diffraction LEED., and electron energy loss spectroscopy EELS.. The Au 111.single crystal surfaces were formed in situ by vacuum deposition on an air-cleaved MoS2 at 590 K in an ultrahigh vacuum. The Auger data obtained at 298 K suggest that the Te overlayer grows in the monolayer plus simultaneous multilayers growth mode at an early stage of Te deposition. LEED results show that the first monolayer of Te is arranged with an incommensurate Au 111.- ʹ3 =ʹ3.R308-Te structure, and that after the completion of the first monolayer, a 3=3.-Te structure appears. However, the 3=3.structure fades out during growth of multilayers. Furthermore, EELS and LEED results represent that no reaction such as surface alloying is occurring during Te deposition. q1999 Elsevier Science B.V. All rights reserved.