Recent experiments have shown that translational energy loss is mainly mediated by electron-hole pair excitations for hydrogen atoms impinging on clean metallic surfaces. Inspired by these studies, quasi-classical trajectory simulations are here performed to investigate the energy transfer after scattering of hydrogen atoms off clean and hydrogen-covered tungsten (100) surfaces. The present theoretical approach examines the coverage effect of the preadsorbed hydrogen atoms, as was done recently for the (110) crystallographic plane in [J. Phys. Chem. C 125, 14075 (2021)]. As suggested, scattering can be described in terms of three different dynamical mechanisms, the contribution of which changes with coverage which allow to rationalize the shape of the energy loss spectra.

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