Abstract
() alloy thin films covered with thin Pd were hydrogenated using 4% in Ar under atmospheric pressure at room temperature. The complex dielectric functions () in the range of 0.75 to of these hydrides were evaluated with spectroscopic ellipsometry. The imaginary part of the dielectric function was composed of one Drude and three Lorentz oscillator terms whose peak positions were about (), (), and (). The term observed in all hydrides is attributed to optical absorption of with . The Drude term, which may be due to unhydrogenated Mg-metal, was observed in the hydrides with a low Ca composition y of less than 0.04. The term was observed in the hydrides with a Ca composition of more than 0.05, while the term was observed for more than 0.11. These and terms were estimated from a variation with hydrogenation of ellipsometric angle Ψ which is due to optical absorption of () and ().
© 2011 Optical Society of America
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