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arXiv · 2604.00709

Role of anisotropic electronic friction in laser-driven hydrogen recombination on copper

Alexander Spears·Wojciech G. Stark·Reinhard J. Maurer
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Abstract

Ultrafast light-driven chemical dynamics at surfaces are governed by energy transfer from excited electrons to vibrational degrees of freedom. When this nonadiabatic energy transfer is anisotropic, it can lead to dynamical steering effects that affect reaction probabilities or non-thermal final energy distributions in molecules. Here, enabled by a machine-learning-based simulation framework, we compare isotropic and anisotropic models of electronic friction during laser-driven hydrogen evolution on the (111) facet of copper. While anisotropic electronic friction determines the rate of energy transfer into the adsorbate and the fluence dependence of desorption probabilities, final translational, vibrational and rotational energy distributions are mainly governed by the potential energy landscape at the barrier and insensitive to nonadiabatic effects.

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Alexander Spears, Wojciech G. Stark, Reinhard J. Maurer. 2026-04-01. Role of anisotropic electronic friction in laser-driven hydrogen recombination on copper. https://arxiv.org/abs/2604.00709

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