Abstract

Second order (χ⁽²⁾) nonlinear spectroscopy has become important as a selective probe of surfaces and interfaces. Recently we and others have used multiple resonances for signal intensity enhancement. In this note, data are presented that demonstrate the increase in selectivity which resonances also provide (allowing selective monitoring of a single-mixture component) and that show the observation of interactions among mixture components and between different adsorbate sites of a single component.

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