How can I be sure that what is happening is a shift, not just an average range of the peak that is too broad? Should I define 10 cm-1 between peaks as a pattern that recognizes shift or this range would be wrong? Can shifts happen in a smaller scale, like 5 cm-1?
To confirm a Raman shift, ensure your spectrometer's resolution can distinguish shifts of 5-10 cm-1 and conduct repeated measurements for consistency. Analyze peak shape and width, and calibrate your system to rule out measurement artifacts.
In addition to Abdelhak Maghchiche 's answer:
if a shift is associated with peak broadening that may indicate you have different components in the material, reporting the FWHM values in the publication is good practice. If you have a Raman microscope, you can see if you can resolve it locally in a spectromicroscopic map.
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