Figure 6: Disentangling the spectroscopic contribution of first- and second-layer Alq3 molecules.
From: Dynamic spin filtering at the Co/Alq3 interface mediated by weakly coupled second layer molecules
(a) Comparison between the UPS spectra of the bare cobalt substrate with the UPS spectra of the Co/Alq3 sample (as-grown, heated at temperatures between 160 °C and 245 °C, and re-grown). The UPS spectra of the as grown sample contain molecular features of both physisorbed (second-layer) and chemisorbed (first-layer) Alq3 molecules. After heating at 245 °C most of the physisorbed molecules are desorbed. (b) Comparison between the static 2PPE spectra of the bare Co substrate with the spectra of the Co/Alq3 sample (as-grown, heated at 245 °C, and re-grown). The energetic position of the uHIS is highlighted by the light-blue area. (c) Time-resolved 2PPE autocorrelation traces recorded at the energetic position of the uHIS from the bare Co substrate, and from the Co/Alq3 sample (as-grown, heated at 245 °C and re-grown). arb. u. arbitrary units.
