IR–visible sum frequency generation (SFG) is a surface specific second-order nonlinear optical mixing process which can provide information on structure and chemistry of molecular adsorbates at either in situ or UHV interfaces.1,2 The nonlinear susceptibility of the surface region is resonantly enhanced when the IR field is tuned across a vibrational transition in the molecular species, provided the transition is both Raman and IR active.3 We have used SFG to study the C-H stretching region (2800-3000 cm−1) of a variety of adsorbates on either metal or transparent dielectric substrates.

© 1989 Optical Society of America

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