PHYSICAL REVIEW LETTERS 2 APRIL 1979 sorption site. Both of these are difficult to determine accurately in SEXAFS. For the angleresolved UPS modulations discussed here, the emissions are measured at fixed final directions kf. This directional dependence results in the determination of d ± , the adsorbate-substrate layer separation distance. In common cases, knowledge of this distance also fixes the chemisorption position.
effect on 0, and do not change our other conclusions.In summary, the data for x c > the overall shapes of the phase boundaries, and the experimentally derived
Nous présentons des mesures de la susceptibilité et du temps de relaxation Ti de l' 3 He liquide confiné dans du grafoil, dans de la poudre d'alumine de 400 A et dans de la poudre de platine de 8u. Nous observons une susceptibilité de Curie-Weiss correspondant à une monocouche d'^He adsorbé qui serait responsable du fort taux de relaxation. Ces effets sont supprimés par quelques couches d ,l *He.
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