Unexpected surface sensitivity at high energies in angle-resolved photoemission

被引：56

作者：

Hofmann, P ^{[1
]}

Sondergaard, C

Agergaard, S

Hoffmann, SV

Gayone, JE

Zampieri, G

Lizzit, S

Baraldi, A

机构：

[1] Univ Aarhus, Inst Storage Ring Facilities, DK-8000 Aarhus C, Denmark

[2] Comis Nacl Energia Atom, Ctr Atom Bariloche, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina

[3] Comis Nacl Energia Atom, Inst Balseiro, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina

[4] Sincrotrone Trieste, I-34012 Trieste, Italy

[5] Univ Trieste, Dipartmento Fis, I-34127 Trieste, Italy

[6] INFM, Lab TASC, I-34012 Trieste, Italy

来源：

PHYSICAL REVIEW B | 2002年 / 66卷 / 24期

关键词：

D O I：

10.1103/PhysRevB.66.245422

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Angle-resolved photoemission data from Al(001) taken with photon energies up to several hundred electron volts show an unexpected surface sensitivity at high energies. The surface state at the center of the surface Brillouin zone can be clearly observed up to photon energies higher than 700 eV. The surface to bulk intensity ratio appears to increase with photon energy, despite the longer inelastic mean-free path of the electrons and the increased vibrational amplitude at the surface. We explain this surprising behavior by considering the effect of phonon excitation in the photoemission event.

引用

页码：1 / 5

页数：5

共 15 条

[1] Excitation of phonons and forward focusing in x-ray photoemission from the valence band [J].