The interaction of hydrogen sulphide with Cu(001)

The interaction of H₂S with a clean Cu(001) surface has been studied by LEED and Auger Electron Spectroscopy. Extra diffraction spots appear at (h +12, k) role=presentation style=font-size: 90%; display: inline-block; position: relative;>$\text{(h +}\text{1}\text{2}\text{, k)}$$\text{(h +}\text{1}\text{2}\text{, k)}$ and (h, k +12) role=presentation style=font-size: 90%; display: inline-block; position: relative;>$\text{(h, k +}\text{1}\text{2}\text{)}$$\text{(h, k +}\text{1}\text{2}\text{)}$ and these are interpreted in terms of two domains of (2 × 1) rotated at 90° to each other. This corresponds to a maximum surface coverage (S/Cu) of 0.5 at 295 K and a H₂S exposure of ≈ 10L. There is prominent streaking in the half-order directions. Less than 5% of a monolayer of S is detectable by Auger spectroscopy.