Abstract
Optical second-harmonic generation from a fixed-frequency laser at λ = 1064 nm has been used to monitor the adsorption of sulfur atoms on a Pd(100) single-crystal surface. The signal observed was dominated by the contribution from the adsorbate atoms to the second-order susceptibility due to a resonance enhancement from a nearby electronic state of the S atom. This enhancement rendered an adsorbate sensitivity of 0.01 monolayer possible.
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