“…Corrected ATR spectra were found to properly reproduce the band position and shape of their transmission equivalents. [ 31 ] The background signal was extracted by means of linear backgrounds applied to the ranges 4,000–3,665 cm −1 , 3,665–3,000 cm −1 , 3,000–2,650 cm −1 , 2,650–2,412 cm −1 , 2,412–2,271 cm −1 , 2,271–1,800 cm −1 , 1,800–1,486 cm −1 , 1,486–1,186 cm −1 , and 1,186–830 cm −1 . Spectra were normalized on the basis of the C–O–C stretching vibration peak located at 1,031 cm −1 .…”