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.
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