Se 3d5/2 binding energy value averages [1].

Se 3d5/2-3d3/2 separation = 0.86 eV [2]
Se 3p3/2: 163 eV
Se 3p1/2: 169 eV
Se 3s: 232 eV

Note that the LMM Auger structure taken with an Al K(alpha) X-ray source for Se is quite extensive (see below) and can cause spectral inteferences with a wide variety of other elements. 
XPS spectrum of ground Se showing the extensive LMM Auger structure (Al X-ray source).

[1] C.D. Wagner, A.V. Naumkin, A. Kraut-Vass, J.W. Allison, C.J. Powell, J.R.Jr. Rumble, NIST Standard Reference Database 20, Version 3.4 (web version) (http:/ 2003.
[2] J.F. Moulder, W.F. Stickle, P.E. Sobol, K.D. Bomben "Handbook of X-Ray Photoelectron Spectroscopy", Perkin-Elmer Corporation, Physical Electronics Division, Eden Prairie, Minn. (1992)