Abstract
The influence of hydrogen on the growth of Y on Ni(001) and Ni(110) at room temperature is studied by full-hemispherical X-ray photoelectron diffraction and X-ray photoelectron spectroscopy. We find that Y starts to form a hydride at a thickness of about 25 Å when evaporating Y under a 10 −6 mbar hydrogen partial pressure. At the same time a weak ordering of the hydride on Ni is observed in the form of a preferential orientation. No ordering occurs for evaporation without hydrogen in ultra-high vacuum.
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