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Discussion des conditions d'existence de la transition de phase de Kosterlitz-Thouless dans l'hydrogene atomique a spin polarise, adsorbe sur la surface de l'helium liquide, en contact avec le gaz d'hydrogene de volume. On montre que la transition de phase aura un effet marque sur la densite des atomes adsorbes. Presentation des calculs dans lesquels on montre que la determination de cette densite de surface, cruciale pour la detection de la transition, peut etre effectuee a travers l'absorption selective de surface du rayonnement resonnant

physical review. b, condensed matter

Resonant-light absorption and the problem of observing the Kosterlitz-Thouless transition in spin-polarized atomic hydrogen adsorbed on a liquid-He surface