Abstract

We have studied the adsorption of HgCl2 on Au surfaces by scanning tunneling microscopy (STM). HgCl2 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 (7×7)R19.1°-2HgCl2. This model supposes that the HgCl2 molecule bends in the adsorption to have a 123° angle between Cl–Hg bonds. In addition, the adsorption capacity of Au(111) surface for HgCl2 was determined to be 2:7.

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