XPS X-ray absorption and X-ray photoemission XAS and XPS I ( FIXED - PowerPoint PPT Presentation

XPS

X-ray absorption and X-ray photoemission XAS and XPS I (  FIXED )

Charge transfer effects in XAS and XPS Charge transfer effects in XAS and XPS • Transition metal oxide: Ground state: 3d 5 + 3d 6 L • Energy of 3d 6 L: Charge transfer energy  3d 6 L XPS XAS  2p 5 3d 5 3d 5 2p 5 3d 7 L  -Q Ground State  +U-Q   2p 5 3d 6 L 2p 5 3d 6

Charge Transfer Effects in XAS Charge transfer effects in XAS 15 Energy (eV)  +U-Q 10 5  0 6 7 8 9 10 3d count

Charge transfer Charge transfer effects in XAS XAS = neutral Self screened Small charge transfer satellites

Charge Transfer Effects in XPS Charge transfer effects in XPS 15 Energy (eV) 10  -Q  5 0 6 7 8 9 10 3d count

Charge transfer effects in XPS Charge transfer effects in XPS XAS = neutral XPS = ionising Large screening Self screened Small charge transfer Large charge transfer satellites satellites

Charge transfer effects in XPS 1s and 2p XPS of Fe2O3

Charge transfer effects in XPS 1s and 2p XPS of Fe2O3

Charge transfer effects in XPS 1s and 2p XPS of Fe2O3

Charge transfer effects in XPS 1s and 2p XPS of Fe2O3

Resonant Auger of NiO

Resonant Auger of NiO Phys. Rev. B. 59, 9933 (1999)

Resonant Auger of NiO 3d 8 → 2p 5 3d 9 2p 5 3d 9 → 3s 0 3d 9 ε Phys. Rev. B. 59, 9933 (1999)

Resonant Auger of NiO 3d 8 → 2p 5 3d 9 3d 9 L → 2p 5 3d 10 L 2p 5 3d 9 → 3s 0 3d 9 ε 2p 5 3d 10 L → 3s 0 3d 10 ε ONLY 2 PEAKS Phys. Rev. B. 59, 9933 (1999)

Resonant Auger of NiO Phys. Rev. B. 59, 9933 (1999)

Resonant Auger of NiO Phys. Rev. B. 59, 9933 (1999)

Resonant Auger of NiO

3d XPS of La2O3

3d XPS of La2O3 “La 3d XPS are due to multiplet effects”

Thermo Fischer explanations on XPS 3d XPS of La2O3 “La 3d XPS are due to multiplet effects?” 4f0 transition to 3d 9 4f 0 + e, so there are NO multiplets (no e-e interactions)

Thermo Fischer explanations on XPS 3d XPS of La2O3 “La 3d XPS are due to multiplet effects?” Explanation by Kotani’s group: J. Elec. Spec. 60, 257 (1992) Peaks split due to charge transfer effect

3d XPS of CeO2 3d 3/2 3d 5/2 4f 0 [4f 1 + 4f 2 ] J. Elec. Spec. 60, 257 (1992)