Surface structure determination of W(001)p(1 × 1)-2H: Chemisorption induced substrate relaxation

Surface structural parameters for the full coverage W(001)p(1 × 1)-2H system have been determined using new LEED measurements and model calculations for bridge-bonded hydrogen. The technique is shown to be clearly sensitive to hydrogen position at the surface with the H-W layer spacing determined to be 1.17 ± 0.04 A ̊ resulting in a H-W bond length of 1.97 Å. The distance between the top two tungsten layers has been determined to be less than 2% contracted relative to bulk termination which is less contraction than measured the for clean W(001) surface by other studies.