Figure 3
Nitrogen K edge-XANES spectra of RA-QD02-0120-afterTEM (RA-afterTEM) and RB-QD04-0047-02 (RB). The peaks assigned include the following: 1 s-π* transition of imine (C = N) at 398.9 eV; 1 s-π* transition of nitrogen heterocycles (C-N = C) and/or nitrile (C ≡ N) at 399.7 eV; and an assembly of small peaks related to the 1 s-π* transition of amide (R-(C = O)NR’2) and the 1 s-3p/s* transitions of pyrrolic (C4H4NH) and amine (R-NH2) at 401 to 402.5 eV.