The position of the band, intensity and shape of the sample

and standard band must be the same if the spectra are

recorded under the same conditions (100% matching)

thanks for your response Mr. Cakic. but there is slight differences. I just want to know the exact compatibility of two spectra.

I'm a bit confused. Are you asking "How do I match a sample spectrum versus a standard spectrum using Bruker (OPUS?) software?" (A software question). If that's the case, we'd need to know what software package you are using.

In OPUS, the option in the menu directory is "Evaluate | Quick Compare". You'll have to first go into "Evaluate | Quick Compare Setup" to load the standard spectrum and set the match parameters. The software doesn't say what kind of matching metric is being used (correlation?) but there are spectral derivative options for pre-processing.

Or are you asking a more generic "How do I match a sample spectrum versus a standard spectrum"? (a more 'spectroscopy' question). That covers the more generic questions of sample presentation and data collection to obtain a 'good spectrum' for a 'good match'. While spectral databases and matching is highly useful, there is no substitute for the ability to actually interpret an infrared spectrum, including identifying artifact peaks.

you have to find out the correlation coefficient (R2) between the two (i.e. sample spectrum and standard spectrum) from their corresponding data values. If R2 is near to 1 then you can say that both are matching and if not then you can predict the degree of matching.