The influence of the distribution of interstitial hydrogen on optical transmission of vanadium hydride

• Hydrogen-induced changes of optical absorption in Fe/V (001) and Cr/V (001) superlattices are found to be dominated by the distribution of microscopic lattice expansions in vanadium. We relate optical transmission spectra between 400-1000nm to hydrogen distribution and site location in vanadium determined with 15N-NRA and compare to first-principles calculations of a uniaxial lattice expansion. An energy shift of a broad absorption peak induces non-trivial changes in the absorbance as a function of wavelength and hydrogen-induced strain. Differently sized hydrogen-depleted layers in otherwise structurally similar vanadium films containing equal hydrogen inventory [H/V], introduce a different optical response due to differing distribution of the induced microscopic volume change. 

Ämnesord

NATURVETENSKAP  -- Fysik -- Den kondenserade materiens fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Condensed Matter Physics (hsv//eng)

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