Rubidium

Rb 3d5/2 binding energies [1]
Rb metal: 111.5 eV
Rb (I) halides: 109.8 - 110.4 eV

Rb 3d5/2 - 3d3/2 splitting: ~ 1.48 eV
Rb 3p3/2: 240 eV
Rb 3p1/2: 249 eV
Rb 3s: 325 eV
Rb 4p: 16 eV
Rb 4s: 31 eV

Reference:
[1] J.F. Moulder, W.F. Stickle, P.E. Sobol, K.D. Bomben, Handbook of X-ray Photoelectron Spectroscopy, Perkin-Elmer Corp, Eden Prairie, MN, 1992.