Doublet Separations #

Tb 3d = 32 eV

Common Overlaps for Tb 3d #

I 3p – Pr 3p – Au NOO (Al Ka X-rays) – K LMM (Al Ka X-rays) – C KLL (Al Ka X-rays)

Auger Energies #

Note – these are listed in KINETIC ENERGY

Tb MNN ≈ 930 eV

Common Binding Energies – Tb 3d #

Theory and Background #

Tb³⁺: 4f⁸ ground-state configuration, typical for Tb₂O₃.

Tb⁴⁺: 4f⁷ (half-filled shell, analogous to Gd³⁺), seen in TbO₂ and Tb₄O₇.

Because Tb can stabilise both +3 and +4, XPS is used routinely to check oxidation state in mixed oxides.

Strong 3d–4f exchange leads to rich multiplet splitting in both 3d₅/₂ and 3d₃/₂.

Charge-transfer satellites are significant, particularly in Tb oxides; they appear several eV above the main peaks.

Lifetime broadening differs between 3d₅/₂ and 3d₃/₂ due to multiplet term-dependent widths.

Experimental Advice #

Prolonged X-ray exposure can induce gradual reduction of Tb⁴⁺ to Tb³⁺, especially in thin films and nanoparticles. Minimise dwell times and monitor sequential scans for spectral changes.

Tb metal oxidises quickly in air, forming Tb₂O₃ and Tb(OH)₃ at the surface.

For Tb⁴⁺ compounds (e.g. TbO₂), surface reduction to Tb³⁺ is common under ambient exposure. Samples should be prepared/transferred under inert atmosphere or measured quickly after preparation.

Data Analysis Guidance #

In Tb³⁺ spectra, the multiplet envelope is broad and asymmetric, making simple peak models insufficient.

In Tb⁴⁺ spectra (TbO₂), the pattern looks more like Gd³⁺ (because of the 4f⁷ half-filled shell). This provides a useful cross-check for assignments.

Reference Datasets #

Coming soon

References #