References 227
As may be seen in Figure 9.52, things are different on the red or infrared side of
the spectrum. In this range of the spectrum, the absorbance is so small that technical applications, exploiting the relatively low price, are not excluded.
Figure 9.52 Absorbance of 12-nm γ-Fe 2 O 3 , maghemite, particles as a function of the
wavelength [29]. This graph shows that in the wavelength range above ca. 700 nm, the
absorbance is so small that technical application is not excluded.
350
450
550
650
750
850
wavelength [nm]
0
0.25
0.5
0.75
1
absorbance
[a.u.]
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