No abstract

We present in situ neutron-reflectivity measurements of the hydrogen and deuterium absorption from the gas phase in a Pd/Nb/Pd thin film multilayer. Hydrogen and deuterium were both preferentially absorbed into the Nb layer at room temperature and at a pressure of 10 Torr. Genetic algorithm fits to the specular data indicate concentrations of approximately 0.71 ͓H͔/͓Nb͔ and 0.51 ͓D͔/͓Nb͔, placing the Nb well into the ␤ phase ͑or an ␣Ј-like phase͒. ͓S0163-1829͑97͒07021-5͔

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