(left) Hydrogen atom on Pd(100) as viewed from (top view) and (side view) planes for the hollow, bridge, top, and subsurface sites. Dimmed circles point at the positions of the hydrogen atom when it is not directly visible at current view. The depicted arrows are proportional to the magnitude of electronic friction. (right) Components of the mass-weighted friction tensor (in ) along Cartesian directions and the isotropic rate as given by LDFA .
Cartesian components of the mass-weighted friction tensor (in ) of a hydrogen atom on Pd(100) as it moves from one equilibrium hollow site to another (first and last points) across a bridge site (middle point). Shown are the relaxation rates along the three Cartesian components, the rate as given by the average of trace of the mass-weighted friction tensor (), and the isotropic rate as given by LDFA .