In my FTIR spectra, more than one peak appeared in the range between 3700 and 4000. What do these peaks indicate? And can I find someone who can help explain my spectra?
These features around 3750cm-1 may just be noise which got enhanced by the intensity calibration, I am not convinced that these are actual peaks.
In general, I would recommend playing around with the settings of your peak finder, because in contrast to these high-wavenumber features I would claim that the things around 600 and 1700 cm-1 are real peaks.