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Adsorbate resonance enhancement in optical surface second-harmonic generation: S on Pd(100)
Institution:1. Institute of Modern Optics, Nankai University, Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology, Tianjin 300350, China;2. Department of Disease Control and Prevention, Rocket Force Characteristic Medical Center, 16 Xinjiekouwai Street, Xicheng District, Beijing 10088, China;1. Department of Forest and Wildlife Ecology, University of Wisconsin Madison, Russell Laboratories, 1630 Linden Drive, Madison, WI, 53706, USA;2. Department of Biology, Franklin College, 101 Branigan Boulevard, Franklin, IN, 46131, USA;3. School of Biological Sciences, Southern Illinois University – Carbondale, 1125 Lincoln Drive Carbondale IL, 62901, USA
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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