Key words: spectral analysis, hydrogen bond, fluid systems
The application of a combined approach to the analysis of strongly coupled spectral bands is demonstrated. An OD-bond stretching vibration, v(OD), band shape in HDO molecule in the mixture [D2O] : [H2O] = 1 : 60 as a function of temperature under the conditions of isobaric heating is taken as an example. The following approaches are used for the analysis of spectral changes: (i) spectral band asymmetry and spectral band derivative analysis, (ii) difference spectroscopy, (iii) 2D-cross-correlation analysis, and (iv) Principal Component Analysis. The obtained results may be used as initial data in the procedure of spectral band fitting. This fact is important for tasks related to interpretation of poorly resolved or strongly overlapped spectral bands.