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VOLUME 47 (1988) | ISSUE 4 | PAGE 187
Role played by roughness in surface-enhanced Raman scattering in connection with scanning tunneling microscopy
The formation of a roughness of superatomic scale during the removal of a monatomic surface layer of silver by electrochemical etching has been observed by scanning tunneling microscopy. This observation implies that an electromagnetic mechanism plays a key role in the enhancement of the nonlinear-optics processes under these conditions.