Adsorption of HgCl_2 molecules on Au(111) surfaces studied by scanning tunneling microscopy

摘要

We have studied the adsorption of HgCl_2 on Au surfaces by scanning tunneling microscopy (STM).HgCl_2 was found to form a stable, ordered overlayer on Au(111) surface in ambient conditions and it was imaged with molecular resolution. We suggest that the revealed structure is (sq root7Xsq root7)R19.1 deg -2HgCl_2.This model supposes that the HgCl_2 molecule bends in the adsorption to have a 123 deg angle between Cl-Hg bonds.In addition,the adsorption capacity of Au(111) surface for HgCl_2 was determinde to be 2:7.