Well, one thing that is certainly different is the probing depth. Na 1s appears at much higher binding energy than Na 2s (and Na 2p) so the kinetic energy of the Na 1s electrons is significantly lower. This means shorter mean free path.

To summarize: while analyzing the Na 1s peak keep in mind that you are more surface sensitive than in the case of Na 2s (and Na 2p) peaks.

Thank a lot for answer but what about the chemical state of Na?

In "different informations" I mean different information about chemical state (bond to Zn and O atoms) of Na atom.

Regards

RJ

If Na is bonded to Zn or O then all sodium peaks should be shifted from the metal position. I would record 1s and 2s to be on the safe side.