Chemisorbed hydrogen on a tungsten(100) surface produces major effects in two regions of the adatom density, at ρ1 ≃ 3 x 1014 and ρ2≈5 x 1014 H/cm2. Changes at ρ2 were probably caused by conventional adatom-adatom interactions, but the effects at ρ1 appeared to have a different origin and it was proposed that hydrogen produced displacement waves in the metal surface which gradually disappeared above ρ1. This type of adsorbate-induced reconstruction could also be observed for H on Mo(100) and Cs on W(100).

Hydrogen on Tungsten(100) - Adsorbate-Induced Surface Reconstruction. R.A.Barker, P.J.Estrup: Physical Review Letters, 1978, 41, 1307-10