Figure 3

(a,c,e,g) Low-BE slope and (b,d,f,h) high-BE slope of the UPS spectra of R, N-500, N-550, and N-570 samples, respectively.
(a,c,e,g) Low-BE slope and (b,d,f,h) high-BE slope of the UPS spectra of R, N-500, N-550, and N-570 samples, respectively.