How to correct for peak shifts in an FTIR spectrum

Hello: Say I have two spectra, Spectrum A and Spectrum B. Spectrum A is the reference spectrum and spectrum B is one I just collected. I'm trying to match spectrum B with the reference spectrum A. However, I realized that the peaks in B are a bit shifted.

My question is how do I correctly align B to the reference A using matlab. Any matlab code or GUI?

Thank you.

Answer 1

[Star Strider]

The only possibility I can think of is the alignsignals (link) function. It’s intended for time-domain signals, not spectra, however it could work for you.

Answer 2

[Larry McDermott]

If it's a simple shift (across the whole range) you can shift one of the spectra by removing leading data points for both the x and y vectors, and then pad the back end of the spectra (I usually just put 0 or the highest Y reading, and increase the x-axis by the step size for however many points the adjustment is for) to maintain a constant # of data points. If it's a nonlinear shift it's less easy, Eigenvector Research has a number of tools including their "Registerspec", "Alignpeaks" and "Alignspectra" which calculate and apply the shift function based on peak locations. http://wiki.eigenvector.com/index.php?title=Calibration_Transfer

[Curious Mind]

Thats great information. Thank you.