Observation of photoemission line widths narrower than the inverse lifetime

E. D. Hansen, T. Miller, T. C. Chiang

Research output: Contribution to journalArticlepeer-review

37 Scopus citations

Abstract

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 zone in the reciprocal space, where the final-state lifetime effect is suppressed, and simultaneously the initial-state lifetime contribution is kinematically compressed.

Original languageEnglish
Pages (from-to)1766-1769
Number of pages4
JournalPhysical Review Letters
Volume80
Issue number8
DOIs
StatePublished - Feb 23 1998
Externally publishedYes

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