Electronic structure and valence-band spectra of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">FeBO</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Based on ab initio electronic-structure calculations by the linear muffin-tin orbital method and the combined analysis of x-ray photoelectron and x-ray B K\ensuremath{\alpha}, O K\ensuremath{\alpha}, and Fe L\ensuremath{\alpha} emission spectra in a common energy scale, the aspects of hybridization within the valence band of ${\mathrm{FeBO}}_{3}$ are discussed in detail. X-ray photoelectron spectra of ${\mathrm{B}}_{2}$${\mathrm{O}}_{3}$ and ${\mathrm{H}}_{3}$${\mathrm{BO}}_{3}$ have also been obtained and are discussed in comparison with that of ${\mathrm{FeBO}}_{3}$.

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