Absolute coverages of deuterium on Cu(100) were determined by using the reaction D(3He, p)4He and a saturation coverage of one deuterium atom per surface copper atom was found. Low-energy electron diffraction observations revealed no superlattice structures below 0.45ML and four different superlattice structures above this coverage.

The Deuterium-Induced Reconstruction of Cu(100) - Correlation of Surface Structures with Absolute Coverage. C.F.Walters, D.B.Poker, D.M.Zehner, E.W.Plummer: Surface Science, 1994, 312[3], L759-66