SEARCH Articles Figures Tables Fourier transform absorbance subtraction Fourier transform phase-shift subtracted Fourier-transform infrared spectroscopy absorbance subtraction Subtracter Subtracting Subtractive Subtractively normalized interfacial Fourier transform infrared Subtractively normalized interfacial Fourier transform infrared spectroscopy Subtractively normalized interfacial Fourier transformation infrared Subtractively normalized interfacial Fourier-transform infrared reflection