Abstract
Optical second harmonic generation (SHG) is a surface and interface probe useful in environments as diverse as ultrahigh vacuum (UHV), electrochemical cells, atmospheric pressure reactors, and solid-solid interfaces. This wide applicability is due to the ability of visible or near-visible light to reach these various interfaces. The interface sensitivity arises since for centrosymmetric media, the second order nonlinear susceptibility is non-zero only where the centrosymmety is broken, ie. at interfaces. A recent review article documents a wide range of applications of this technique.1
© 1989 Optical Society of America
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