Observation of photoemission line widths narrower than the inverse lifetime

被引：34
作者：
Hansen, ED
Miller, T
Chiang, TC
机构：
[1] Univ Illinois, Dept Phys, Urbana, IL 61801 USA
[2] Univ Illinois, Frederick Seitz Mat Res Lab, Urbana, IL 61801 USA
来源：
PHYSICAL REVIEW LETTERS | 1998年 / 80卷 / 08期
关键词：
D O I：
10.1103/PhysRevLett.80.1766
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Quantum mechanics stipulates that experimental spectral lines cannot be narrower than the inverse lifetime. However, this limitation can be overcome in angle-resolved photoemission, and we have observed unusually narrow photoemission peaks derived from a bulk valence band of Ag. This observation is made possible by judiciously choosing a grazing emission geometry to reach a specific tune in the reciprocal space, where the final-state lifetime effect is suppressed, and simultaneously the initial-state lifetime contribution is kinematically compressed.
引用
收藏
页码：1766 / 1769
页数：4
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