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For example, in the following 10 ppm scan of methylene chloride in ambient air, its
characteristic absorption peak at around 13.5 microns is practically obscured at low
concentrations by other components in the air (Figure 13-11, upper). Only at higher
concentrations or by compensating for other compounds (see second scan at 100 ppm
compensated for air) can certain peaks be easily identified (Figure 13-11, lower).
0.045
0.040
0.035
0.030
0.025
0.020
0.015
0.010
0.005
0.000
8
0.400
0.350
0.300
0.250
0.200
0.150
0.100
0.050
0.000
8
-0.050
Chapter 13 Infrared Spectroscopy Tutorial
Methylene Chloride at 10 ppm
(uncompensated for air)
9
10
Wavelength In Microns
Methylene Chloride at 100 ppm
(compensated for air)
9
10
Wavelength In Microns
Figure 13-11. Scans of Methylene Chloride
13-11
11
12
13
11
12
14
13
14
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