Abstract
We present spectroscopic data on the electronic structure of $\mathrm{YbS}$ under pressure. From resonant x-ray emission and x-ray absorption spectra in the high-resolution partial fluorescence yield mode, we find that the $\mathrm{Yb}$ valence increases from $2.3$ at ambient pressure to $2.6$ at $360\phantom{\rule{0.3em}{0ex}}\mathrm{kbar}$. The accuracy of these estimates is enhanced by a combined analysis of emission spectra measured as a function of the incident and emitted energy. The spectral line shapes reflect the mixed character of the electronic states, intermediate between atomic and bandlike.
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