Role played by roughness in surface-enhanced Raman scattering in connection with scanning tunneling microscopy
Aktsipetrov O. A. , Vasil'ev S. I., Panov V. I.
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.