Visible-Light-Active Titania Photocatalysts: The Case of N-Doped s—Properties and Some Fundamental Issues
Figure 11
Average absorption spectrum of visible-light-active -doped specimens (curve
1);
difference absorption spectra of N-doped rutile crystal (curve 2) and of the color centers in the yellow anatase crystal (curve 2a).
Curve 3 (solid squares) depicts the difference between curves 2 and 2a; curve 3a
(line) is the Gaussian fit
of curve 3 (see text for more details).
