Photoemission study of CuO andCu2O single crystals

Electronic structures ofCu2O,Cu4O3, and CuO: A joint experiment

“…The deeper probing depth of XPS picks up the contributions from both oxidation states of Cu, leading to a broadening and shift of the apparent peak energy. Such surface reduction effects seem also to be present in CuO, and are likely related to the vacuum instabilities in observed in previous photoemission studies [56], as discussed below.…”

“…However, in the XPS spectrum with more Cu 3d sensitivity and larger penetration depth than UPS, the peak shifts to about −3.5 eV closer to the predicted Cu-3d maximum. The peak at about −3 eV in the UPS spectrum of CuO has also been observed by Thuler et al [57] and Shen et al [56]. However, Shen et al also observed a sideband feature at −4 eV, which disappeared after exposure to vacuum and which was speculated to be due to non-bonding oxygen states.…”

Cu–O–Cr Hybridization Effects on the Electronic Structure of a Hole-Doped Delafossite Oxide CuCr1−xMgxO2

“…2(a). There are two satellite peaks at 13 eV and 15 eV, which correspond to Cu 3d 9 → 3d 8 and 3d 9 4s → 3d 8 4s processes, respectively [15][16][17]. In the x = 0.03 sample, the large resonance behavior of the 13-eV satellite was observed and this is consistent with the Cu 3d character of doped-holes.…”

Exchange and Correlation Effects in Electronic Excitations ofCu2O

“…In the first four columns we give theoretical values at the experimental lattice parameter for the photoemission band gap (E g ), the absorption threshold (E 0 ), and the photoemission peaks A1 to F1 labeled in Ref. [16]. These are compared with the experimental values (last column).…”