Cross Correlation

Sama,
It would help if you were a little more specific about the problem.
However, after some googling, I understand that you are dealing with spectroscopy data.
I'd start by treating your data as matrices and using the MatrixOp functions in Igor.
For example, to calc the cross correlation matrix (generalised case), subtract the average spectrum from all spectra(to normalise) then multiply the normalised matrix by its transpose.
This will give you the cross correlation matrix. Use a contour plot to image the resulting matrix.
If this isn't what you want, or I have misunderstood, I think that dealing with the data in this way should give you a start.
Jason.

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