Abstract

The interpretation of the conversion patterns of molecular hydrogen adsorbed on amorphous solid water confirms the electromagnetic nature of the process. Magnetic spin-orbit coupling and hyperfine contact introduce some electron spin-orbital excitation in the H2-ASW ground state. The molecule-solid electron repulsion evacuates the H2 rotation momenta. The theoretical rates fit the experimental ones in magnitude and steep temperature dependence. Fundamental discussion focus on the role of the surface electric field and on the dissipation of the rotational energy by the solid phonons.

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