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The electric quadrupole hyperfine interaction at Cu (100) surfaces has been detected at isolated ^111In probe atoms by use of the perturbed angular correlation technique. The electric-field-gradient tensor at T=295 K was found to be axially symmetric with a strength of |Vₙₙ|=1. 0 (2) 10^18 V/cm^2 and the symmetry axis perpendicular to the (100) surface. A linear temperature dependence of the electric field gradient was observed. These findings support the assumption of highly symmetric surface sites as positions for the ^111In probes.
Klas et al. (Mon,) studied this question.