can anyone please give me the explanation about red and blue shift in XPS? and its important in data interpretation?
Well, of course it is important. It's usually referred to as a "chemical shift" like in NMR and it is highly dependent on the state of the atoms.
A primitive example: if you have single and double charged cations of the same species in your solid, the double charged ion of course has less electron density which results in a stronger interaction between the nucleus and the remaining electrons. Therefore these will have a higher binding energy which results a lower kinetic energy in comparison with the single charged ion. [For anions, it's the other way around, of course.]
Thus, you can deconvolute the signal of a specific element and learn something about the distribution of chemical states. A "textbook quality" example of this can be found in this work:
Article Atomic Oxygen on Graphite: Chemical Characterization and The...
One more thing: you're observing electrons, not photons. Therefore I would not recommend to use the terms "blue shift" or "red shift".
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