Presentation Information
[1C17]Formation of three rotational ice domains on Au(111) above the bilayer ice growth temperature
*Hiroyuki Koshida1, Kota Iwata2, Yoshiaki Sugimoto2, Markus Wilde3, Katsuyuki Fukutani3 (1. Department of Basic Science, The University of Tokyo, 2. Department of Advanced Materials Science, The University of Tokyo, 3. Institute of Industrial Science, The University of Tokyo)
We investigated the structural evolution of ice on Au(111) as a function of deposition temperature using LEED and AFM. Water deposition at 136 K resulted in bilayer ice formation, as evidenced by a (√3×√3)R30° LEED pattern. However, above ∼144 K, bilayer formation was suppressed and an 18-spot concentric LEED pattern emerged. AFM imaging revealed that this pattern originated from three hexagonal ice domains that were rotated 20° relative to each other. Interestingly, this three-domain structure was not observed when ASW was annealed, which emphasizes the critical role of deposition temperature. Our results demonstrate that bilayer ice is a metastable structure on Au(111) and that elevated-temperature deposition results in rotationally ordered ice domains. We discuss the origin of these domains in terms of rotational epitaxy and its role in domain selection during nucleation and growth.