Anisotropy in the Adsorption of H2O at Low Coordination Sites on Pt(111).

摘要: The ${\mathrm{H}}_{2}$O adsorption on Pt(111) at 140 K is investigated by temperature-variable scanning tunneling microscopy. adsorbs preferentially the upper side of step edges. At these low coordination sites adsorbates are bound stable as quasi-one-dimensional chains up to 160 K. In contrast, desorption from two-dimensional islands terrace has already started 145 occupancy edges different two types dense packed steps. This anisotropy correlated with dipole moment