SEARCH Articles Figures Tables SNIFTIRS (Subtractively Normalized Interfacial Spectroscopy subtractively normalized interfacial Fourier Subtracter Subtracting Subtractive Subtractively normalized interfacial Fourier Subtractively normalized interfacial Fourier SNIFTIRS) 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 Subtractively normalized interfacial spectroscopy