Monomer and cluster molecules of water (D2O) adsorbed on Ni(111) surface were studied at 20 K by infrared reflection absorption spectroscopy. At a low coverage of water (less than theta = 0.03), a singleton-like monomer water molecule dominated on top of a Ni atom on Ni(111) surface. When the coverage of water was increased (0.03 < theta < 0.33), ring hexamer like water cluster molecules grew on the surface at wide coverage ranges at 20 K. The spectroscopic features of the infrared spectra of the ring hexamer like cluster molecule adsorbed on Ni(111) surface were quite similar to those on Pt(111) and Ru(001) surfaces. (C) 2003 Elsevier B.V. All rights reserved.