Abstract
The 1H( 15N, αγ) 12C resonant nuclear reaction has been used to measure the hydrogen coverage on the (110) and (111) faces of Pt 0.5Ni 0.5 single crystals. Surface treatments prior to adsorption experiments as well as beam-induced defects have been investigated for ensuring a correct determination of the hydrogen concentration. Hydrogen coverage has been measured from 115 to 400 K in the 10 −8-10 −4 mbar H 2 pressure range. The maximum coverage is one monolayer on the (110) face and 0.2 monolayer on the (111) face. An interpretation for these low values, compared with the coverage of Ni(110) and Pt(111), is proposed. The composition variation of the first three atomic layers of the crystals accounts for this difference.
Published Version
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