Barium

Ba 3d5/2 Values:
Barium Metal 780.1 +/- 0.7 eV, 4 citations
BaO 779.6 +/-0.3 eV, 5 citations
BaSO4 780.5 +/ 0.4, 4 citations
BaS 779.8 eV, 1 citation

From work in this laboratory:
BaTiO3 780.4 eV
BaSO4 (vacuum fractured) 780.5 +/-0.1 eV, 4 analyses

Ba 3d5/2 - 3d3/2 splitting: 15.33 eV
Ba 3p3/2: 1064 eV
Ba 3p1/2: 1138 eV
Ba 3s: 1292 eV
Ba 5p: 15 eV
Ba 5s: 31 eV
Ba 4d5/2: 90 eV
Ba 4d3/2: 93 eV
Ba 4p3/2: 179 eV
Ba 4p1/2: 193 eV
Ba 4s: 254 eV
Ba 3d XPS spectrum of vacuum fractured BaSO4.