By use of the photoemission-into-electrolyte technique, the photoyields of silver have been measured for $p$- and $s$-polarized light in the energy range 3 to 5 eV with a wide range of incident angles. Pronounced structure, providing striking evidence for the validity of the nonlocal theory of the surface photoeffect, is obtained.

• Received 16 September 1975

DOI:https://doi.org/10.1103/PhysRevLett.35.1461