The proton magnetic resonance rigid-lattice second moment in YH, » and YHl 98 has been measured in the temperature range 160-200 K. From these the occupancy factors for hydrogen in the octahedral and tetrahedral interstitial sites of the fcc metal lattice have been determined. A significant fraction ( 10-15%) of the octahedral sites are found to be occupied, consistent with features observed in the optical properties of YH, .
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