Abstract
The dynamical evolution of a surface spin state submitted to repeated H 2 molecular scattering is investigated by means of a stochastic model. When the striking molecules librate during their surface lifetime, it is found that the surface spins become fully polarized. In particular, the surface magnetization is enhanced by a factor of 100 when a magnetic field is applied. This effect has the important consequence that it lowers the catalyst temperature (up to 80 K) while the molecular flow remains at 170 K.
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