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Y. Ozaki et al.
Fig. 4.4 a Spectral changes of a system consisting of two components having Gaussian type bands
with different peak wavenumbers (7300 and 7250 cm −1 ), different intensities (10→5 and 10→20),
and different band widths (59 and 118 cm −1 ). b Variations of each band. c The difference spectra
calculated using the first spectrum (pink color) as a reference. d An enlargement of c. e The second
derivative of the spectra shown in a. Prepared by Y. Morisawa
7250 cm
−1 ), different intensities (10→5 and 10→20), and different band widths(59
and 118 cm
−1 ). Figure 4.4b depicts variations of each band and Fig. 4.4c displays the
difference spectra calculated using the first spectrum (pink color) as a reference. Note
that peak positions (7309, 7239 cm
−1 ; Fig. 4.4c) are shifted in the difference spectra
compared with positions in the original spectra. Figure 4.4d exhibits an enlargement
of Fig. 4.4c. A ghost peak appears near 7380 cm
−1 because the widths of these two
bands are significantly different from each other. Therefore, a special care must be
taken for feeble peaks.
Y. Ozaki et al.
Fig. 4.4 a Spectral changes of a system consisting of two components having Gaussian type bands
with different peak wavenumbers (7300 and 7250 cm −1 ), different intensities (10→5 and 10→20),
and different band widths (59 and 118 cm −1 ). b Variations of each band. c The difference spectra
calculated using the first spectrum (pink color) as a reference. d An enlargement of c. e The second
derivative of the spectra shown in a. Prepared by Y. Morisawa
7250 cm
−1 ), different intensities (10→5 and 10→20), and different band widths(59
and 118 cm
−1 ). Figure 4.4b depicts variations of each band and Fig. 4.4c displays the
difference spectra calculated using the first spectrum (pink color) as a reference. Note
that peak positions (7309, 7239 cm
−1 ; Fig. 4.4c) are shifted in the difference spectra
compared with positions in the original spectra. Figure 4.4d exhibits an enlargement
of Fig. 4.4c. A ghost peak appears near 7380 cm
−1 because the widths of these two
bands are significantly different from each other. Therefore, a special care must be
taken for feeble peaks.