  We investigate the influence of hydrogen on the electronic structure of a
binary transition metallic glass of V$_{80}$Zr$_{20}$. We examine the
hybridization between the hydrogen and metal atoms with the aid of hard x-ray
photoelectron spectroscopy. Combined with ab initio density functional theory,
we are able to show and predict the formation of $s$-$d$ hybridized energy
states. With optical transmission and resistivity measurements, we investigate
the emergent electronic properties formed out of those altered energy states,
and together with the theoretical calculations of the frequency-dependent
conductivity tensor, we qualitatively support the observed strong
wavelength-dependency of the hydrogen-induced changes on the optical absorption
and a positive parabolic change in resistivity with hydrogen concentration.
