Figure 4
From: Band Alignment and Controllable Electron Migration between Rutile and Anatase TiO2

Comparison of TIRA-ESS in vacuum.
a, TIRA-ESS for anatase nanoparticles of three different sizes of 8, 19 and 200 nm. b, TIRA-ESS for anatase and rutile nanoparticles of similar size around 20 nm, the inset shows the corresponding normalized spectra.